MarketKing plugin for WordPress before 2.1.72 contains a missing authorization vulnerability in the marketkinggetpagecontent AJAX action that allows authenticated attackers with subscriber-level access or higher to access arbitrary vendor administrator panel pages by supplying an arbitrary vendor user ID. Attackers can bypass authorization controls by submitting a target vendor ID in the request to access payout pages, financial reports, and vendor dashboard content belonging to any vendor in the marketplace.

MarketKing plugin for WordPress before 2.1.72 contains a missing authorization vulnerability in the marketkingadminvendorsajax AJAX action that allows authenticated attackers with subscriber-level access or higher to retrieve the complete vendor directory by sending a crafted AJAX request. Attackers can exploit the absence of capability checks in the vendor management action to retrieve internal user IDs, usernames, and email addresses of all registered vendors, exposing personally identifiable information to any logged-in user regardless of role.

MarketKing plugin for WordPress before 2.1.72 contains a missing authorization vulnerability in the marketkingduplicateproduct AJAX action that allows authenticated attackers with subscriber-level access or higher to duplicate any vendor's product by supplying an arbitrary product ID. Attackers can bypass ownership verification to copy any vendor's product listings, including private product metadata, and assign the duplicated copy to their own vendor account without the victim's knowledge or consent.

MarketKing plugin for WordPress before 2.1.72 contains a missing authorization vulnerability in the marketkingsendrefund AJAX action that allows authenticated attackers with subscriber-level access or higher to create refund requests against any order by supplying an arbitrary order ID. Attackers can submit crafted AJAX requests targeting any order ID to create fraudulent refund requests against orders they did not place, enabling marketplace disruption and unauthorized interference with other users' orders.

The MarketKing — Ultimate WooCommerce Multivendor Marketplace Solution plugin for WordPress is vulnerable to Stored Cross-Site Scripting via plugin's settings in all versions up to, and including, 1.9.80 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Shop Manager-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfilteredhtml has been disabled.

The MarketKing — Ultimate WooCommerce Multivendor Marketplace Solution plugin for WordPress is vulnerable to unauthorized access due to missing capability checks on several functions like 'marketkingdeleteteammember', 'marketkingrejectuser', 'marketkingsaveprofilesettings', and many more in all versions up to, and including, 2.0.00. This makes it possible for unauthenticated attackers to delete users, update settings, approve users, and more.