Is CVE-2026-22659 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-22659?

CVE-2026-22659 has a CVSS v3 severity of HIGH (8.1).

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CVE-2026-22659

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.