SMS for Lead Capture Forms <= 1.1.0 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Message Deletion

The SMS for Lead Capture Forms plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the delete_message() function in all versions up to, and including, 1.1.0. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary messages.