Vulnerability · Published Jul 10, 2026 · Assigned by VulnCheck

CVE-2026-22660FlaskBB Logic Flaw Authorization Group Deletion via Bulk AJAX Endpoint

High 7.2

In plain English

A high-severity security flaw in flaskbb from flaskbb. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)0.6%top 50.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
flaskbb	flaskbb	0 – through 2.2.0

Weakness: CWE-697 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-r9cf-jxr6-5h3r) vendor-advisory
Patch Commit patch
https://www.vulncheck.com/advisories/flaskbb-logic-flaw-authorization-group-deletion-via-bulk-ajax-endpoint third-party-advisory