High 8.1Published Jul 10, 2026

CVE-2026-22659FlaskBB Authorization Bypass via Topic ID Manipulation

Updated under an hour ago (Oct 27, 2026, 11:20 PM ET)

Does this affect you?

It affects flaskbb. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for flaskbb

Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

flaskbb flaskbb flaskbb:flaskbb (from the name)	through 2.2.0; https://github.com/flaskbb/flaskbb/commit/a5da9a52 not affected	CNA record

References

References

https://github.com/flaskbb/flaskbb/security/advisories/GHSA-9rjj-9p2h-6c55	vendor-advisory
https://github.com/flaskbb/flaskbb/commit/acc88cfedd011124395e0101cb27432a47f712be	patch
https://www.vulncheck.com/advisories/flaskbb-authorization-bypass-via-topic-id-manipulation	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.