vBulletin 5.x through 5.1.6 allows remote authenticated users to bypass authorization checks and inject private messages into conversations via vectors related to an input validation failure.
- http://www.vbulletin.com/forum/forum/vbulletin-announcements/vbulletin-announcements_aa/4319488-security-patch-released-for-vbulletin-5-1-4-5-1-6-and-vbulletin-cloud
No PoCs found on GitHub currently.