CVE-2026-22659

High

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductFlaskbb

PublishedJul 10, 2026

First seenJul 10, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Patches

github.com/flaskbb/flaskbb/commit/acc88cfedd011124395e0101cb27432a47f712be

Vendor advisories

github.com/flaskbb/flaskbb/security/advisories/GHSA-9rjj-9p2h-6c55

Affected products

Product	Affected versions	Fixed in
flaskbb flaskbb	v ≤ 2.2.0	—

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