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:
- Download the patch for the version of vBulletin you're currently running from https://members.vbulletin.com/patches.php.
- Extract the vBulletin patch files from the zip file.
- Upload the patch files to your server, overwriting the old files.
Files updated in the patch for vBulletin 3.8.7 * 4.0 - 4.1.12 (Suite & Forum).
Files updated in the patch for vBulletin 4.2 (Suite & Forum).
Licensed customers can discuss the security patch - HERE
Special thanks to cellarius, Andreas, s.molinari, and the vBulletin Germany team.