Executive brief
FluentBoards is a WordPress plugin used to organize content and collaboration around boards. The plugin fails to properly check permissions when listing which boards a user is a member of, allowing any logged-in user—even those with minimal access—to discover the private board memberships of other users by simply knowing their account ID.
Technical details
The vulnerability is an insecure direct object reference (IDOR) stemming from inadequate authorization checks in the board membership disclosure endpoint. When returning the list of boards a user belongs to, the plugin does not verify whether the requester has permission to access that information for other users. An authenticated attacker with Subscriber role or higher can exploit this by making requests with arbitrary user IDs to enumerate private board memberships. The attack requires only authentication and knowledge of target user IDs; no further interaction is needed. This vulnerability was fixed in version 2.0.15.
Affected products
- FluentBoards FluentBoards before 2.0.15
Timeline
- 2026-09-14: disclosed
- 2026-09-15: patched: Fix available in version 2.0.15