vBulletin 5.0.0 through 5.7.5 and 6.0.0 through 6.0.3 allows unauthenticated users to invoke protected API controllers' methods when running on PHP 8.1 or later, as demonstrated by the /api.php?method=protectedMethod pattern, as exploited in the wild in May 2025.
| Software | From | Fixed in |
|---|---|---|
| vbulletin / vbulletin | 5.0.0 | 5.7.5.x |
| vbulletin / vbulletin | 6.0.0 | 6.0.3.x |