Vulnerability Description
FlaskBB through 2.2.0, fixed in commit acc88cf, contains an authorization bypass vulnerability that allows authenticated moderators to perform unauthorized actions on topics in forums they do not control by submitting crafted topic ID lists. Attackers can include a low-ID topic from a permitted forum as an anchor in a batch request, causing the permission check applied only to the first result to pass, and then execute lock, unlock, delete, or hide actions against topics in unmoderated forums.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/flaskbb/flaskbb/commit/acc88cfedd011124395e0101cb27432a47f712
- https://github.com/flaskbb/flaskbb/security/advisories/GHSA-9rjj-9p2h-6c55
- https://www.vulncheck.com/advisories/flaskbb-authorization-bypass-via-topic-id-m
- https://github.com/flaskbb/flaskbb/security/advisories/GHSA-9rjj-9p2h-6c55
FAQ
What is CVE-2026-22659?
CVE-2026-22659 is a vulnerability with a CVSS score of 8.1 (HIGH). FlaskBB through 2.2.0, fixed in commit acc88cf, contains an authorization bypass vulnerability that allows authenticated moderators to perform unauthorized actions on topics in forums they do not cont...
How severe is CVE-2026-22659?
CVE-2026-22659 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-22659?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.