vBulletin before 5.5.6pl1, 5.6.0 before 5.6.0pl1, and 5.6.1 before 5.6.1pl1 has incorrect access control.
packetstormsecurity.com/files/157716/vBulletin-5.6.1-SQL-Injection.html
packetstormsecurity.com/files/157904/vBulletin-5.6.1-SQL-Injection.html
attackerkb.com/topics/RSDAFLik92/cve-2020-12720-vbulletin-incorrect-access-control
forum.vbulletin.com/forum/vbulletin-announcements/vbulletin-announcements_aa/4440032-vbulletin-5-6-1-security-patch-level-1