CVE-2026-33543

FOSSBilling is a free, open-source billing and client management system. Versions 0.7.2 and prior expose a guest API endpoint, /api/guest/staff/create, intended for initial administrator bootstrap. Due to a flawed admin-existence check, the endpoint remains usable after an administrator already...

CVE-2026-33543 FOSSBilling: Authentication bypass allows unauthenticated administrator creation

FOSSBilling is a free, open-source billing and client management system. Versions 0.7.2 and prior expose a guest API endpoint, /api/guest/staff/create, intended for initial administrator bootstrap. Due to a flawed admin-existence check, the endpoint remains usable after an administrator already...

CVE-2026-33543

FOSSBilling versions 0.7.2 and earlier expose a guest API endpoint /api/guest/staff/create intended for initial admin bootstrap. A flawed admin-existence check (is_countable() used on a Model_Admin object or null) makes the guard always evaluate true, allowing unauthenticated creation of an admin...