CVE-2026-22660
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.61%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 4.0
- 8.6 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.61% probability · 47th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-697
- Source
- disclosure@vulncheck.com
References
- https://github.com/flaskbb/flaskbb/commit/a5da9a529adddc65fe31e275192b642a4e32de64
- https://github.com/flaskbb/flaskbb/security/advisories/GHSA-r9cf-jxr6-5h3r
- https://www.vulncheck.com/advisories/flaskbb-logic-flaw-authorization-group-deletion-via-bulk-ajax-endpoint
- https://github.com/flaskbb/flaskbb/security/advisories/GHSA-r9cf-jxr6-5h3r
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.