CVE-2026-45116

MyBB versions prior to 1.8.40 have a type-confusion flaw in UserDataHandler::verify_profile_fields() (inc/datahandlers/user.php): when a checkbox/multiselect profile field is submitted as a non-array value, the is_array() check is skipped, bypassing specialized validation. The unchecked value is ...

PT-2026-77170

MyBB is free and open source forum software. Prior to 1.8.40, the user datahandler does not properly validate checkbox and multiselect profile field types, resulting in stored JavaScript code injection. UserDataHandler::verify profile fields only performs the specialized validation when is...