CVE-2026-12224: Dokan Pro <= 5.0.4 - Authenticated (Vendor+) Privilege Escalation via update_capabilities REST Endpoint

The Dokan Pro plugin for WordPress is vulnerable to privilege escalation via updatecapabilities REST Endpoint in all versions up to, and including, 5.0.4. This is due to the updatecapabilities() REST handler accepting arbitrary capability strings from the request body and passing them directly to WPUser::addcap() with no allowlist validation, only verifying that the caller holds the dokandar capability. This makes it possible for authenticated attackers with a self-provisioned Vendor-level access and above, on sites with the Vendor Staff module enabled, to grant arbitrary WordPress capabilities, including administrator, to any vendorstaff account, leading to a full site takeover.