Using PHP 5 Becomes Dangerous in 2 Months

WordPress, Joomla, Drupal and many other popular website CMSs were written in a programming language called PHP. PHP version 5 is about to reach end-of-life and will stop receiving security updates in two months. Many WordPress and other PHP websites remain on version 5.6 or older. Once support for PHP 5 ends in two months, these sites are in a precarious position and will become exploitable as new PHP 5 vulnerabilities emerge without security updates.

This post is Copyright 2018 Defiant, Inc. and was published on the official blog. Republication of this post without permission is prohibited. You can find this post at:

This post is in a FAQ format and describes why PHP 5 is reaching end-of-life, what the timeline is and what to do about it. The Wordfence team is working to create awareness of this issue in the WordPress and broader PHP community. You can help by sharing this post with your colleagues that manage PHP websites or use WordPress.

What is End-Of-Life or ‘EOL’ in Software?

When a software product reaches EOL, it is no longer supported by software developers. That means that, even if someone finds a security hole in the software, the developers will not fix it.

If a development team is productive, they will release many versions of the software they work on over time. It becomes impractical to support every version of the code ever released. So a compromise needs to be made.

This compromise is that the development team will only support their software for a certain amount of time. After that time has elapsed, the development team suggests that the user community upgrade to a newer version of the same software, which usually does things better than the old versions and is fully supported.

Is PHP Version 5  going to be EOL soon?

Yes. PHP version 5 will be declared End-Of-Life on January 1st, 2019. That is, in approximately two months at the time of writing.

The PHP development team’s policy with regards to end-of-life is as follows: each release of PHP is fully supported for two years from the date of release. Then it is supported for an additional year for critical security issues only. Once three years has elapsed from the date of release, the version of PHP is no longer supported.

PHP 7.0, the very first PHP 7 release, was released on 3 December, 2015, almost three years ago. PHP version 5 is rapidly approaching end-of-life and will no longer be supported starting on 1 January, 2019.

The final branch of PHP version 5 that is still supported is PHP 5.6. Because this is the final PHP 5 branch, the PHP team chose to extend the security fix period from the usual one years, to two years. That extended security support will end on 1 January 2019.

The following table includes the important dates for PHP 5 and PHP 7 branches. You can find this table on this page on the PHP website.

Why Should I Upgrade to PHP 7?

As mentioned above, PHP 5 will no longer be supported with security fixes, starting on 1 January 2019. That means that even if a vulnerability is discovered, it won’t be fixed, leaving your website vulnerable.

PHP 7 has many improvements over PHP version 5. These include performance improvements. PHP 5 has many known bugs that relate to performance, memory usage and more. PHP 7 is actively supported and developers are therefore able to implement those improvements and make your website run faster, be more stable and use your expensive resources more efficiently.

As an added benefit, PHP 7 also allows the use of more modern programming structures, which is a nice benefit for software developers.

How can I find out my PHP version?

If you are using WordPress and running the Wordfence security plugin, simply go to “Tools”, then click on the “Diagnostics” tab at the top right. Scroll down to the “PHP Environment” section and you will be able to see your PHP version on the right side of the page.

Alternatively you can install this extremely basic plugin on your WordPress site which will display your PHP version. Please note that this plugin is not produced by the Wordfence team and we do not endorse it.

If you have FTP access to your website, you can create a file with a name that is hard to guess. Then add the following two lines:



Save the file in your web root directory and then visit the file in your web browser. Your PHP version will be displayed at the top of the screen. Don’t forget to delete your temporary file once you’re done.

Which specific version of PHP 7 should I upgrade to?

Ideally, you should upgrade to PHP 7.2 which is the newest version of PHP. This version will be fully supported for another year and will receive security updates for a year after that.

If you are unable to upgrade to 7.2, then at a minimum you should upgrade to PHP 7.1. Full support for PHP 7.1 will end in 1 month. However, you will continue to receive security updates for another year after that.

Do not upgrade to PHP 7.0. This version will also become end-of-life in one month.

Does PHP 5 have any vulnerabilities?

Security vulnerabilities are continuously reported in PHP. Some of these are serious. Viewing this page on will give you an idea of the volume and severity of PHP vulnerabilities that have recently been reported.

Many of the vulnerabilities reported in PHP were discovered this year. Many more will be discovered in PHP version 5 next year, after security support for all versions of PHP 5 have ended. That is why it is critically important that you upgrade to a version of PHP 7 that is supported and is receiving security updates.

Will anything break if I update to PHP 7.2?

You may discover incompatibilities that need to be fixed by a developer if you update to PHP 7.2. PHP has undergone some changes since version 5 which has improved the language and made it more secure, but may result in warnings or errors for code that has not been made compatible with PHP 7.

If you are a WordPress user, WordPress core is fully compatible with PHP 7.2 and greater.

However, it is very important that you make sure that your themes and plugins are also compatible with PHP 7.2. If you are using an unmaintained theme or plugin, you may encounter warnings or errors due to incompatibilities. For this reason, we recommend you test your website on a hosting account or server that is running PHP 7.2. If you encounter any problems, contact the developer of the theme or plugin and ask them for an urgent fix. Remind them that PHP 5.6 reaches end-of-life in just two months and that you must update to PHP 7.2 by then.

This page has a migration guide for PHP developers who are migrating code from PHP 5.6 to PHP 7.

This page has a list of deprecated functions under PHP 7.2 and will be helpful to a developer that is migrating code from PHP 5 to PHP 7.

What if my hosting company does not support PHP 7?

Your hosting account should include some kind of control panel or options and settings page. If you’re not seeing an option to upgrade to PHP 7, you should contact your hosting company’s support team to see what your options are. If none are available, we recommend you transition to new hosting before the end of the year.

What if my developer does not support PHP 7?

PHP 7.0 was released two years and 10 months ago. If your developer’s plugin, theme, or other PHP product does not support PHP 7 at this point, it is quite likely that the project is unmaintained. If the project was being maintained, then they would have had users who are using PHP 7 report problems within the last 2 years and 10 months, which they would have fixed.

Using unmaintained software is a bad idea because it means that security vulnerabilities are not being fixed. So if you do encounter incompatibilities when upgrading to PHP 7.2, this may be a red flag and may indicate you should move on to using an alternative product that is being actively maintained.

What is the easiest way to upgrade to PHP 7.2?

Many hosting providers offer a one click PHP version change in CPanel. This allows you to switch to PHP 7 and check your site for problems. If something doesn’t work, you can switch back and create a plan for addressing the issues you found.

If you can’t find where to update your PHP version, your hosting provider can advise you how to update PHP in their environment. It may mean them making a change on their end or even moving your site to another server.

Remind me again why I need to update to PHP 7.2?

The really good news is that you are probably going to see a nice performance improvement when you update your site. Sure, you may need to deal with a few, hopefully minor incompatibilities. But once you have updated to PHP 7.2, you can rest assured that you will continue to receive security updates until November 30, 2020.

If you remain on PHP 5.6, you may find yourself dealing with a hacked site some time next year when a vulnerability is released for PHP 5.6 and no fix is released by the PHP team because PHP 5.6 is end-of-life.

How can I help?

This deadline is coming up fast. All versions of PHP 5 will stop receiving security updates in 2 months. There are a huge number of websites that are still on PHP 5. As soon as security updates end, attackers will be highly motivated to find vulnerabilities that they can exploit, because those vulnerabilities will not be fixed and will be exploitable for a long time.

To help transition the global web community to PHP 7, please spread the word by sharing this post and helping create awareness about this tight deadline and how to transition to PHP 7.

The post Using PHP 5 Becomes Dangerous in 2 Months appeared first on Wordfence.


Three WordPress Security Mistakes You Didn’t Realize You Made

Considering the amount of malicious activity that takes place on the internet, it’s no surprise that successful attacks on WordPress sites are launched across a wide variety of vectors. Whether outdated plugin code is to blame, or password reuse, or any number of other security flaws, no site owner sets out to introduce a vulnerability into their environment. Ultimately any security issue begins with a mistake, and while mistakes are forgivable there’s still risk involved if they’re not discovered and remedied.

This post is Copyright 2018 Defiant, Inc. and was published on the official blog. Republication of this post without permission is prohibited. You can find this post at:

In today’s post, we’ll look at a few common mistakes made by owners of WordPress sites that can create security concerns. These mistakes aren’t strictly application-specific, but are issues many WordPress users will encounter in the course of running their site.


Mistake 1 – Abusing Addon Domains

In the era of one-stop-shop customer experiences, it can be attractive for a WordPress design agency to be able to offer site hosting to their clients. However, when corners are cut in the implementation of such solutions, security flaws begin to surface.

Web hosts commonly make use of user-friendly control panels, like cPanel and Plesk, to improve the process of handling many server-side tasks for typical websites. Common operations like FTP user management and database setup can be done easily by just about anyone through a handy web interface. Many hosting companies running such control panels also allow their users to create and host multiple domains within a single account. In cPanel and most other contexts, these are called addon domains. With addon domains, a user can easily start and manage a number of sites without investing in separate hosting accounts for each of them. Many shared hosting providers encourage this use of addon domains, offering plans which allow users to run “unlimited” sites on a single account. However, misusing addon domains can create an insecure condition in the event that multiple users have access to the account–authorized or otherwise.

When a script on a webserver is accessed by a client, like a visitor requesting WordPress’s index.php file, the process is executed by a certain user account on the server itself. On typical WHM/cPanel servers, web processes are run as the user associated with the site’s cPanel account. Put another way, if I have a cPanel account with the username mikeyv and host three WordPress sites on it, every PHP process for each site executes as mikeyv on the server itself. This means that scripts running on one site have the ability to read and write files on other sites within the same cPanel account. Consequently, if those three WordPress sites each belong to a different one of my clients, it becomes possible for someone with file access to any one of the sites to influence the rest.

What’s The Problem?

There are two primary causes for concern with this particular mistake. First, in general this means that a disgruntled or otherwise troublemaking contributor to one of your addon domains can be disruptive (or worse) to other sites in your account. As long as they have FTP access or administrative permissions to their site, they can cause considerable damage to your account if they’re of a mind to. Even in cases where an FTP account associated with one of the addon domains may be jailed to its own site’s directory, if the user is able to upload a PHP file they can traverse the entirety of the cPanel account with a web shell or similar script.

The second cause for concern is in the case of a security incident. If one site is vulnerable and an attacker installs a backdoor, they now have complete access to further infect the rest of the sites you’re hosting. This scenario is a common one, and often results in cases of repeated reinfection. When the owner of the cPanel account is unaware of the scope of the infection, it’s common for the individual infected sites to be restored by their respective owners, allowing them to be immediately reinfected by scripts contained elsewhere in the account.

What Should I Do?

If you don’t host multiple sites within the same hosting account, you’re in the clear. If you do host multiple sites in one account, but you and other administrators are approved to access them all, just remain aware that any security issue for one site is an issue for all of them.

However, if you host multiple sites in the same account that belong to different clients, or each have different administrators, it should become a priority to get these sites isolated as soon as possible. While there are costs associated with maintaining hosting accounts for each client, it simply isn’t worth the risk to your business if an incident were to occur.

Mistake 2 – Unsafe Copying & Renaming

It’s always a good idea to make a backup of an important file if you’re making a risky change to it. After all, it’s already bad enough that something is getting tweaked on the live site, so you’d better make sure you can revert the change quickly in case it doesn’t behave as intended. The tricky part here is that depending on how you’re making the backup copy of that file, you could be exposing sensitive information about your site.

It’s fairly common to see these hastily-made copies of files given names ending in something like .bak or .old. For example, if someone is making a quick change to their site’s wp-config.php file, they might make a copy first and name it wp-config.php.bak. That way, later on they can easily identify the contents and purpose of the file in case they need to restore it.

What’s The Problem?

The issue here stems from the way your web server treats files based on their extensions. While there’s nothing inherently “magic” about file extensions like .php and .jpg, applications will typically use the extension as a way to interpret how a file should be handled. In particular, a web server is going to see a request to a file ending in “.php” and assume it contains PHP code to be processed locally. Once processed, the response sent to the client contains the output of the script, but not the code itself.

When a file is instead given an unknown extension like .bak, the server will need to fall back on default behavior in determining what to do if the file is requested by a client. In most cases, the default behavior will be to treat it as a download and simply send the requested file as-is to the client. This means if an attacker successfully guesses that our example site contains a file named wp-config.php.bak, they can download that file and read its contents, giving them access to database credentials and cryptographic salts.

Additionally, unsafe directory backup practices can allow highly vulnerable code to remain accessible on your site long after it would have been removed otherwise. For example, if you redesigned your site and left the old one in a subdirectory like /oldsite or /backup for some reason or another, those directories will still be accessible on the web. Any vulnerable code present in the defunct sites may still allow an attacker to breach your environment and infect your primary site.

What Should I Do?

Short answer, don’t leave files hanging around your WordPress environment when you no longer need them. In the cases where you must, though, just be sure to keep a file’s original extension at the end of the renamed file. To call back our example above, wp-config_backup.php is still a perfectly descriptive name which has the advantage of not being freely downloadable to anyone on the internet.

For the sake of completeness, yes, it’s possible to hack in some special handling for your .bak files into your site’s .htaccess or webserver configuration. With that said, it’s far outside the scope of this article, and still probably a better idea just not to use the unsafe extension to begin with.

Mistake 3 – Hosting Email On Your Webserver

The initial shopping stage of building a web presence can be tough. Eventually though, you nabbed a good deal for a hosting plan and–Score!–it came with unlimited free email accounts! You knew there were professional email solutions around, but you seriously can’t beat free.

Fast forward a bit, and now you’ve got a site pulling in a respectable amount of traffic, and a dozen or more inboxes belonging to members of your team. They use their email to talk to each other, send documents to clients, and receive any number of automated emails from various services.

What’s The Problem?

As we discussed in Mistake 1 above, all of the files in a cPanel account are owned by the same user. This user also happens to pass on its authority to any PHP scripts it executes. What many fail to realize is that the email inboxes within your cPanel account are all still just files living under that very same account ownership.

The practical implication of this situation is similar to the above. Any user with filesystem access on the account (whether it’s a legitimate FTP user, or a WordPress administrator, or a malicious intruder) can access the directory structure that contains all of the cPanel account’s mailboxes.

While the immediate privacy concerns of someone reading someone else’s email are obvious, the problem compounds when third-party services are considered. Effectively, this means that an attacker is able to perform password resets for accounts associated with the cPanel-hosted email addresses, since they can copy the email validation links out of the raw email file directly. This technique can allow the attacker to pivot from a web application breach to much larger scopes, depending on the kind of accounts associated with affected email addresses. Is your company Twitter account associated with one of these addresses? How about financial accounts?

What Should I Do?

If the email for your domain is hosted on a cPanel account (or any similar environment, as this isn’t necessarily a cPanel-specific problem), consider your use case carefully. If you’re running a hobby blog and just need a simple address, you’re probably okay as long as you’re aware of the risks. If you’re running a business of any notable size, though, it’s highly recommended that you seek out a standalone email solution in order to isolate mail from your webserver entirely.

Note that these warnings apply to typical shared environments, and individual systems may be configured more or less securely. Through use of open_basedir and disable_functions restrictions to prevent PHP from reading files outside of allowed directories or from executing system calls, it can be made more difficult for an attacker to access email hosted on the account. However, these measures are far from bulletproof and there are documented methods to bypass such restrictions. In general, it’s still a safer decision just to get the mailboxes onto a different environment.


Whether it’s the result of a hasty shortcut or honest inexperience, mistakes are bound to happen and don’t have to be the end of the world. Just be sure to remain mindful of the decisions you make in the process of running your website. Don’t cram a bunch of clients into the same hosting account, don’t leave sensitive files accessible to the web, and don’t keep your email where someone else could read it. Thanks for reading!


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Yes, You Should Probably Have A TLS Certificate

Last week’s article covering the decision to distrust Symantec-issued TLS certificates generated a great response from our readers. One common question we received, and one that pops up just about any time SSL/TLS comes up, is how to determine when a site does and does not need such a certificate. Spoiler: Your site should probably have a TLS certificate.

This post is Copyright 2018 Defiant, Inc. and was published on the official blog. Republication of this post without permission is prohibited. You can find this post at:

A subject of some discussion in the web community surrounds the use of TLS certificates and the implementation of HTTPS that these certificates allow. While their use is critical on sites where sensitive data from visitors may be involved, like payment data or other personally identifiable information (PII), the debate concerns the use of HTTPS in cases where users aren’t providing sensitive input. In today’s post, we’ll take a practical look at the difference between HTTP and HTTPS traffic, and discuss the benefits of being issued a certificate regardless of the way users interact with your site.

What’s TLS? Is It Different From SSL?

Before we really dig in, let’s clear up some terminology for anyone who might be unfamiliar.

HTTPS (short for Hypertext Transfer Protocol Secure) allows for the secure transmission of data, especially in the case of traffic to and from websites on the internet. The security afforded by HTTPS comes from the implementation of two concepts, encryption and authenticationEncryption is a well-known concept, referring to the use of cryptography to communicate data in a way that only the intended recipient can read. Authentication can mean different things based on context, but in terms of HTTPS it means verification is performed to ensure the server you’re connecting to is the one the domain’s owner intended you to reach. The authentication portion of the transaction relies on a number of trusted sources, called Certificate Authorities (CA for short). When a certificate is requested for a domain name, the issuing CA is responsible for validating the requestor’s ownership of that domain. The combination of validation and encryption provides the site’s visitors with assurance that their traffic is privately reaching its intended destination, not being intercepted midway and inspected or altered.

TLS, or Transport Layer Security, is the open standard used across the internet to facilitate HTTPS communications. It’s the successor to SSL, or Secure Sockets Layer, although the name “SSL” has notoriously picked up common usage as an interchangeable term for TLS despite it being a deprecated technology. In general when someone brings up SSL certificates, outside of the off chance they’re literally referring to the older standard, they’re probably talking about TLS. It’s a seemingly minor distinction, but it’s one we hope will gain stronger adoption in the future.

I Shouldn’t Use TLS Unless I Really Need To, Right?

There’s no shortage of conflicting advice across the web regarding when to implement TLS and when to leave a site insecure, so it’s no surprise that a lot of strong opinions develop on both sides of the issue. Outside of cut-and-dry cases like PCI compliance, where payment transactions need to be secure to avoid a policy violation, you’ll find plenty of arguments suggesting cases where the use of TLS is unnecessary or even harmful to a website. Common arguments against the wide use of TLS tend to fall into two general categories: implementation and performance.

Concerns about implementation difficulties with TLS, like the cost of purchasing a certificate, difficulty in setting up proper HTTPS redirects, and compatibility in general are common, but are entirely manageable. In fact, TLS has never been more accessible. Let’s Encrypt, a free certificate issuer which launched in early 2016, has issued just under two-thirds of the active TLS certificates on the internet at the time of this writing. Following the flood of free certificates into the marketplace, many popular web hosting companies have begun allowing Let’s Encrypt certificates to be installed on their hosted sites, or are at least including their own certificates for free with their hosting. After all, site owners are more security-conscious now than ever, and many will happily leave a host if TLS is a cost-prohibitive endeavor.

Other pain points in the implementation of HTTPS, like compatibility with a site’s existing application stack, are no different than the pain points you’d see following other security best practices. Put simply, avoiding the use of HTTPS because your site will break is the same as avoiding security updates because your site will break. It’s understandable that you might delay it for a period of time so you can fix the underlying issue, but you still need to fix that issue.

The other arguments against widespread TLS are those of performance concerns. There’s certainly overhead in play, considering the initial key exchange and the processing necessary to encrypt and decrypt traffic on the fly. However, the efficiency of any system is going to depend heavily on implementation. In the case of most sites, the differences in performance are going to be negligible. For the rest, there’s a wealth of information available on how to fine-tune an environment to perform optimally under TLS. As a starting point, I recommend visiting Is TLS Fast Yet? to learn more about the particulars of this overhead and how best to mitigate it.

My Site Doesn’t Take Payments, So Why Bother?

Each debate ultimately hinges on whether the site owner sees value in HTTPS in the first place. A lot of the uncertainty in this regard can be traced to unfamiliarity with the data stored in HTTP requests, as well as the route that these requests travel to reach their destination. To illustrate this, let’s take a look at the contents of a typical WordPress login request.

The request contains a number of interesting pieces of information:

  • The full URL of the destination, including domain and file path
  • User-Agent details, which describe my browser and operating system
  • My referer, which reveals the page I visited prior to this one
  • Any cookies my browser has stored for this site
  • The POST body, which contains the username and password I’m attempting to log in with

The implications of this request falling into the wrong hands should be immediately recognizable in the fact that my username and password are plainly visible. Anyone intercepting this traffic can now establish administrative access to my site.

Contrast this with the same request submitted via HTTPS. In an HTTPS request, the only notable information left unencrypted is the destination hostname, to allow the request to get where it needs to go. As far as any third party is concerned, I’m sending this request instead:

Outside of examples as obvious as login security, the thing to keep in mind above all is the value of privacy. If a site’s owner hasn’t installed a TLS certificate, even though the site is purely informational and takes no user input, any traffic to that site can be inspected by the user’s ISP, or even the administrator of the network they’re connected to. This is notably problematic in certain cases, like when someone might be researching private medical or legal matters, but at the end of the day the content of a site is irrelevant. Granted, my hat probably contains a bit more tinfoil than most, but there’s no denying this is an era where browsing habits are tracked wherever possible. Real examples exist of ISPs injecting advertising into unencrypted traffic, and the world has a nonzero number of governments happy to inspect whatever traffic they can get their hands on. Using HTTPS by default shows your site’s users that their privacy is important to you, regardless of whether your site contains anything you might consider private.


The internet at large is rapidly adopting improved security standards, and the majority of web traffic is now being delivered via HTTPS. It’s more important than ever to make sure you’re providing your users with the assurance that their traffic is private, especially with HTTP pages being flagged as “Not Secure” by popular browsers. Secure-by-default is a great mindset to have, and while many of your users may never notice, the ones who do will appreciate it.

Interested in learning more about secure networking as it pertains to WordPress? Check out our in-depth lesson, Networking For WordPress Administrators. It’s totally free, you don’t even need to give us an email address for it. Just be sure to share the wealth and help spread the knowledge with your peers, either by sharing this post or giving them the breakdown yourself. As always, thanks for reading!

The post Yes, You Should Probably Have A TLS Certificate appeared first on Wordfence.


Reminder: Popular Browsers To Distrust Symantec SSL/TLS Certificates Starting In October

This is a final reminder that legacy TLS certificates issued by Symantec, including those issued by authorities like Thawte, Geotrust, and RapidSSL which used Symantec as a central authority, will be distrusted by both Google Chrome and Mozilla Firefox beginning in October. Apple products have partially distrusted these certificates and plan to also distrust the full set of certificates at some point in Fall 2018. Digicert has acquired the Certificate Authority (CA) and its infrastructure, and is issuing free replacement certificates for all affected customers. If you have already replaced your certificate, no action is needed.

This post is Copyright 2018 Defiant, Inc. and was published on the official blog. Republication of this post without permission is prohibited. You can find this post at:

Mozilla has estimated around 1% of the top million websites are still using certificates which will no longer be accepted by most web browsers in the next month, despite the year of warning. If you are currently using Firefox or Chrome, you can simply visit your website and check the browser console (Ctrl+Shift+J in Windows and Linux, or Cmd+Shift+J on Mac for Firefox and Cmd+Option+J for Chrome) to see if your certificate is in danger of being distrusted. If you use Firefox Nightly or Chrome Canary you may already see the standard “Invalid Certificate” warning rather than your site.

Example warning from the Chrome console for a site with an affected certificate

Why Is This Happening?

When we last reminded our users about this 6 months ago, questions like “Why do browser vendors care?” and “Why is this happening?” filled the comments section of the post.

Browser vendors care because these certificates are used to verify you are connecting to the server you intended. Without getting buried in technical details of public key cryptography and certificate chains, this is done by having a pool of central authorities that verify an issued certificate goes to the proper owner of a website. Your computer has a list of trusted authorities stored on it, and compares every certificate it sees to this list. This means that, in addition to encrypting the data in transit between you and the server, you can also be assured that you are communicating with the correct server. This prevents actions such as a Man In The Middle (MITM) attack, where a malicious actor attempts to intercept or alter traffic between a user and a server.

The challenging part of being a Certificate Authority (CA), like Symantec was, is properly verifying who is being issued a certificate, which leads us to why this change is taking place. Back in 2016, users noticed Symantec issuing certificates against certain guidelines, and posted this information to a Mozilla security mailing list. This was the latest in a series of problems with the Symantec CA. After much discussion between other major CAs, the decision was made to distrust Symantec and remove it as an authority. If you’re curious about further technical details, the majority of this discussion was conducted via public mailing lists available online.

This is a final reminder, as the next upcoming browser releases will entirely distrust these certificates. Please check your site and replace the certificate as needed!

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