Today, we are releasing XenForo 2.0.11 to address a potential security vulnerability. We recommend that all customers running XenForo 2.0 upgrade to 2.0.11 or use the attached patch file as soon as possible.

The issue is a XSS vulnerability. XSS (Cross Site Scripting) issues allow scripts and malicious HTML to be injected into the page, potentially allowing data theft or unauthenticated access.

Specifically, the issue relates to specially crafted text entered into messages and output using the structured text system (used in profile posts and comments).

There are no other fixes included in this version. There will be a further maintenance release in the coming weeks.

Full details for how to install and upgrade XenForo can be found in the XenForo Manual.