Incorrect Authorization

Overview FlaskBB is an A classic Forum Software in Python using Flask. Affected versions of this package are vulnerable to Incorrect Authorization via manipulation of the topicid parameter in batch requests. An attacker can perform unauthorized actions such as locking, unlocking, deleting, or...

CVE-2026-22659

FlaskBB up to version 2.2.0 is vulnerable to an authorization bypass. The issue arises when an attacker manipulates a batch request with crafted topic ID lists, causing a low-ID topic from a permitted forum to be used as an anchor and bypass the permission check applied only to the first result. ...

CVE-2026-22659 FlaskBB Authorization Bypass via Topic ID Manipulation

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...