vBulletin Forum v4.1.3 PL1 & 3.8.7 PL1 released – Yahoo YUI Security patch download

vBulletin Publishing Suite v4.1.3 PL1, Forum Classic v4.1.3 PL1 and v3.8.7 PL1 have been released with security patch available for download to fix Yahoo YUI security exploit. Full details here.

Update: heads up seems vB 3.8.7 PL1 patch zip and full zip download are missing the actual Yahoo YUI 2.9.0 files right now, probably need to wait for vBulletin to update the download. For now you can do the below manual fix outlined by setting YUI to remote Google or Yahoo with class_core.php changes to point to 2.9.0 version. But vB 3.8.7 PL1’s patch and release is just a precautionary one as the actual Yahoo YUI security exploit only applies to vB 4.1.x specific file that exists only in vB 4.1.x and not in vB 3.8.x series.

Yahoo YUI Security Exploit
We have been notified of a potential, but unconfirmed exploit in vBulletin 3 and 4 (all versions) via the Yahoo YUI component library.
To rectify this issue we have released a patch for the latest version of vBulletin 3 and vBulletin 4, vBulletin 3.8.7 and vBulletin 4.1.3. Forthcoming vBulletin 4.1.4 will not be affected.
As such, we have released:

  • vBulletin Publishing Suite 4.1.3 PL1
  • vBulletin Forum Classic 4.1.3 PL1
  • vBulletin Forum Classic 3.8.7 PL1

Upgrade Process
The upgrade process is the same as previous patch level releases – simply download the patch from the Members Area, extract the files and upload to your webserver, overwriting the existing files. There is no upgrade script required.

As with all security-based releases, we recommend that all customers upgrade as soon as possible in order to prevent any potential damage resulting from the flaw being exploited.

New installations/upgrades
If you are upgrading your site, or installing a new copy of our software, the latest software packages include the patch. These can be downloaded from your Members Area

To manually fix versions prior to vBulletin 4.1.3 and 3.8.7

  1. Edit one line in class_core.php file located in /includes/class_core.php ; find the following line “define(‘YUI_VERSION’, ‘2.7.0’); // define the YUI version we bundle” ; replace this line with “define(‘YUI_VERSION’, ‘2.9.0’); // define the YUI version we bundle”
  2. In AdminCP; Go to “Options” => “Server Settings and Optimization Options” ; find “Use Remote YUI” option and in the dropdown switch to a server of your choice, Google or Yahoo.


MaxCDN Site Acceleration

Get Cost Effective Content Delivery
Unbeatable speed, stats, & price

Leave a Comment