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XenForo.com XenForo 2.1.15, 2.2.16 Patch 1 and XenForo Media Gallery 2.1.9, 2.2.6 Released (Includes Security Fixes)


Today we are advising all customers running XenForo that a potential security vulnerability has been identified. All affected customers should either upgrade to XenForo 2.1.15 or XenForo 2.2.16.

If you are a XenForo Cloud customer, a fix has been rolled out automatically, and no further action is required to address this issue.

If you are running a pre-release version of XenForo 2.3, you should follow the instructions in the announcement thread for the XenForo 2.3.0 Release Candidate 1 release.

The issue relates to a potential cross-site request forgery and code injection vulnerability which could lead to a remote code execution (RCE) or cross-site scripting (XSS) exploit.

XenForo extends thanks to independent security researcher, Egidio Romano (EgiX), working with SSD Secure Disclosure.

We recommend doing a full upgrade to resolve the issue, but a patch can be applied manually to any version. See below for further details.

To patch this issue manually you will need to edit one file manually and upload some changed files.

Find the following line in this file:


$parts = explode(':', $string, 3);

Replace that line with the following:


        if (!$string) return '';
        if (strpos($string, ':') === false)
            $pattern = '#^\\\?'
                . str_replace('%s', '([A-Za-z0-9_\\\]+)', preg_quote(ltrim($formatter, '\\')))
                . '$#';
            if (!preg_match($pattern, $string, $matches))
                throw new \InvalidArgumentException(sprintf(
                    'Class %s does not match formatter pattern %s',
            // already a class
            return $string;
        $parts = explode(':', $string, 3);

Note: This file cannot be patched automatically as it contains install-specific data. You must apply this change manually to any XenForo installation running XenForo 2.1 or 2.2 to effectively fix the issue.

Step 2: Upload XF files​

  • Download either 2115-patch.zip (for XenForo 2.1) or 2216-patch.zip (for XenForo 2.2).
  • Extract the .zip file
  • Upload the contents of the upload directory to the root of your XenForo installation

Step 3: Upload XFMG files (for XenForo Media Gallery customers only)​

  • Download either xfmg219-patch.zip (for XenForo Media Gallery 2.1) or xfmg226-patch.zip (for XenForo Media Gallery 2.2).
  • Extract the .zip file
  • Upload the contents of the upload directory to the root of your XenForo installation

Note: If you decide to patch the files instead of doing full upgrades, your "File health check" will report these files as having "Unexpected contents". Because these files no longer contain the same contents your version of XF was shipped with, this is expected and can be safely ignored.

As always, new releases of XenForo are free to download for all customers with active licenses, who may now grab the new version from the customer area or upgrade from your Admin control panel (Tools > Check for upgrades...).

XenForo 2.2.16 Released​

XenForo 2.2.16 is now available for all licensed customers to download. We strongly recommend that all customers running previous versions of XenForo 2.2 upgrade to this release to benefit from increased stability.

One-click upgrade to XenForo 2.2.16

Directly from your admin control panel

If you are a XenForo Cloud customer, your upgrade will be scheduled automatically.

Some of the changes in XF 2.2.16 include:

As always, new releases of XenForo are free to download for all customers with active licenses. You may now upgrade from your admin control panel or grab the new version from the customer area.

Current requirements​

Please note that XenForo 2.2 has higher system requirements than earlier versions.

The following are minimum requirements:
  • PHP 7.2 or newer (PHP 8.2 recommended)
  • MySQL 5.5 and newer (Also compatible with MariaDB/Percona etc.)
  • All of the official add-ons require XenForo 2.2.
  • Enhanced Search requires at least Elasticsearch 2.0.

Installation and upgrade instructions​

Full details of how to install and upgrade XenForo can be found in the XenForo 2 Manual. We strongly recommend upgrading directly from within your control panel.


Last edited by a moderator: Today at 4:49 PM
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