A recent vBulletin report indicated that there was a potential exploit vector in flood protection. Once the cause of the issue was isolated, code changes were made to eliminate the reported threat.

This issue affects BOTH vBulletin 3 and vBulletin 4 (Suite & Forum).

A patch has been issued for vBulletin 3.8.7 through 4.2.

To improve the security of your vBulletin 4 installation, please download the patch from the members area of vBulletin: http://members.vbulletin.com/

The standard upgrade process for a patch level release is:


  1. Download the patch for the version of vBulletin you're currently running from https://members.vbulletin.com/patches.php.
  2. Extract the vBulletin patch files from the zip file.
  3. Upload the patch files to your server, overwriting the old files.



Advanced Users:

Files updated in the patch for vBulletin 3.8.7 * 4.0 - 4.1.12 (Suite & Forum).

  • includes/class_dm_threadpost.php
  • includes/class_floodcheck.php
  • includes/version_vbulletin.php



Files updated in the patch for vBulletin 4.2 (Suite & Forum).

  • includes/adminfunctions.php
  • includes/class_dm_threadpost.php
  • includes/class_floodcheck.php
  • includes/class_upgrade_420a1.php
  • install/init.php
  • install/mysql-schema.php
  • vb/activitystream/populate/forum/thread.php
  • includes/version_vbulletin.php



Licensed customers can discuss the security patch - HERE


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