vBulletin 3.6.3 Released - Security Fix for XSS Cross-Site Scripting Flaw

vBulletin 3.6.3 Includes Internet Explorer Security Fix
Jelsoft has official released version 3.6.3 of vBulletin to correct a vulnerability in all versions of Windows Internet Explorer.
3.6.3 includes 50 bug fixes from vBulletin 3.6.2.
They recommend a full upgrade, but are also providing patches.
The announcement includes a list of required template edits and changed files.