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Vulnerability record · CVE-2026-22659 · published 10 July 2026

CVE-2026-22659: Incorrect authorization vulnerability

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.

7.2 CVSS 4.0 High EPSS 0.53% · top 57.8% CWE-863 · Incorrect authorization Deferred
7.2CVSS 4.0 base score
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
14 Jul 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-22659), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.