The Frontend Admin by DynamiApps plugin for WordPress is vulnerable to improper missing encryption exception handling on the 'fea_encrypt' function in all versions up to, and including, 3.19.4. This makes it possible for unauthenticated attackers to manipulate the user processing forms, which can be used to add and edit administrator user for privilege escalation, or to automatically log in users for authentication bypass, or manipulate the post processing form that can be used to inject arbitrary web scripts. This can only be exploited if the 'openssl' php extension is not loaded on the server.
The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.