MultiVendorX 5.0.0 - 5.0.15 - Subscriber+ Arbitrary Store Data and Ownership Overwrite via stores REST Endpoint

The MultiVendorX WordPress plugin before 5.0.16 does not verify that a user owns the store they are acting on in one of its REST API routes, allowing any authenticated user, such as a subscriber, to overwrite any store's details and payout settings and to replace the record of who owns it.