WWBN AVideo is an open source video platform. In versions 29.0 and below, the "allowOrigin($allowAll=true)" function in "objects/functions.php" reflects any arbitrary "Origin" header back in "Access-Control-Allow-Origin" along with "Access-Control-Allow-Credentials: true". This function is called by both "plugin/API/get.json.php" and "plugin/API/set.json.php" — the primary API endpoints that handle user data retrieval, authentication, livestream credentials, and state-changing operations. Combined with the application's "SameSite=None" session cookie policy, any website can make credentialed cross-origin requests and read authenticated API responses, enabling theft of user PII, livestream keys, and performing state changes on behalf of the victim. Commit caf705f38eae0ccfac4c3af1587781355d24495e contains a fix.