The Paytium: Mollie payment forms & donations plugin for WordPress is vulnerable to unauthorized API key update due to a missing capability check on the paytium_sw_save_api_keys function in versions up to, and including, 4.3.7. This makes it possible for authenticated attackers with subscriber-level access to change plugin API keys.
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.