Vulnerability in Flaskbb
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. 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.
EPSS: 0.003 (25.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Flaskbb — versions 0, https://github.com/flaskbb/flaskbb/commit/a5da9a52
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-22660?
- CVE-2026-22660 is a high-severity vulnerability in Flaskbb, classified under Incorrect Comparison. CVSS score: 7.2/10. Published 2026-07-10.
- How severe is CVE-2026-22660?
- High severity. CVSS v3 base score is 7.2 out of 10.