The issues are XSS vulnerabilities. XSS (Cross Site Scripting) issues allow scripts and malicious HTML to be injected into the page, potentially allowing data theft or unauthenticated access.
XenForo extends thanks to security researcher Vincent ibn Winnie for reporting the issues.
We recommend doing a full upgrade to resolve the issues, but a patch can be applied manually. See below for further details.
If you are currently running 2.1, the automatic upgrade check will now allow you to upgrade to 2.1.12 within your control panel. Once you are running the latest 2.1 release, it will report that an upgrade to 2.2 is available. If you would like to upgrade to 2.1.12 and the control panel reports that 2.2.0 is available, you may manually check for upgrades via Tools > Check for upgrades.
Please be aware that XenForo 2.0 is no longer supported or receiving security updates. We strongly recommend that customers running 2.0 upgrade to the current version.
Applying a patch manually
Download the 2112patch.zip file attached to this message. It will contain the following file:
Note: If you decide to patch the files instead of doing a full upgrade, your "File health check" will report these three 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...).
Download XenForo 2.1.12
From the licensed customer area
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.
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