FlaskBB vulnerabilities

Server-Side Request Forgery (SSRF) vulnerability in FlaskBB, a forum software written in Python using Flask. Prior to version 2.2.1, the get_image_info() function allows any authenticated user to force the server to send HTTP requests to arbitrary internal endpoints, including cloud metadata services. This is a blind SSRF with confirmed internal port scanning and internal API triggering capabilities.

FlaskBB through version 2.2.0 contains a logic flaw vulnerability that allows authenticated administrators to delete all built-in authorization groups. The issue is a type mismatch in the bulk AJAX endpoint, where JSON integer group IDs are compared against string literals, causing the protection check to always pass.

FlaskBB through version 2.2.0 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.