Authorization group deletion via mismatched ID types
Published Jul 10, 2026 · Updated Jul 10, 2026
Logic flaw in FlaskBB 2.2.0 and earlier allows remote authenticated administrators to delete all built-in authorization groups. The bulk deletion path in flaskbb/management/views.py compares integer group IDs from JSON with protected-group string literals, so its intersection test is empty and deletion proceeds. Administrator access and a valid CSRF token are required; deleting the six standard groups destroys the forum permission model and can make the site unusable.
Summary
What happened
Logic flaw in FlaskBB 2.2.0 and earlier allows remote authenticated administrators to delete all built-in authorization groups. The bulk deletion path in flaskbb/management/views.py compares integer group IDs from JSON with protected-group string literals, so its intersection test is empty and deletion proceeds. Administrator access and a valid CSRF token are required; deleting the six standard groups destroys the forum permission model and can make the site unusable.
The record
- CVE
- CVE-2026-22660
- Published
- Jul 10, 2026
- Updated
- Jul 10, 2026
- Vendor
- FlaskBB
- Product
- FlaskBB
- Classifications
- CWE-697, T1485
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Jul 10, 2026CVE publishedPublication date reported by the CVE source.
- Jul 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=2.2.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- FlaskBB bulk group deletion request proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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