The Motors WordPress plugin before 1.4.124 does not properly verify that a user is authorised to modify a listing before processing one of its listing management actions, allowing authenticated attackers with subscriber-level access and above to set metadata on posts they do not own, including overwriting product prices. Exploitation is possible only when WooCommerce is active and the Motors WordPress plugin before 1.4.124's paid featured-listing option is enabled, neither of which is a default configuration.

The Motors – Car Dealership & Classified Listings plugin for WordPress is vulnerable to Payment Bypass via insecure user meta update in all versions up to, and including, 1.4.103 This is due to the stmsaveuserextrafields() function updating sensitive user meta fields from POST data without verifying that the current user should have permission to modify those fields. The function hooks into the 'personaloptionsupdate' action and only checks currentusercan('edituser', $userid), which passes for any user editing their own profile. This makes it possible for authenticated attackers, with Subscriber-level access and above, to set their stmpaymentstatus to 'completed', bypassing the PayPal payment verification and gaining access to paid Dealer membership features without completing any transaction.