CVE-2026-22660
FlaskBB Logic Flaw Authorization Group Deletion via Bulk AJAX Endpoint
CVSS Score
7.2
EPSS Score
0.0%
EPSS Percentile
0th
FlaskBB through 2.2.0, fixed in commit a5da9a5, contains a logic flaw vulnerability that allows authenticated administrators to delete all built-in authorization groups by exploiting a type mismatch in the bulk delete protection check. The bulk AJAX endpoint in the management views compares received JSON integer group IDs against string literals, causing the protection check to always pass, which allows deletion of all six built-in groups and destroys the forum's permission model, potentially rendering the site unusable.
| CWE | CWE-697 |
| Vendor | flaskbb |
| Product | flaskbb |
| Published | Jul 10, 2026 |
| Last Updated | Jul 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
flaskbb / flaskbb
0 ≤ 2.2.0
References
github.com: https://github.com/flaskbb/flaskbb/security/advisories/GHSA-r9cf-jxr6-5h3r github.com: https://github.com/flaskbb/flaskbb/commit/a5da9a529adddc65fe31e275192b642a4e32de64 vulncheck.com: https://www.vulncheck.com/advisories/flaskbb-logic-flaw-authorization-group-deletion-via-bulk-ajax-endpoint
Credits
Hamed Kohi (@0xHamy) VulnCheck