The Adwised Web Push Notification WordPress plugin through 2.5.7 does not have authorisation checks on several state-changing operations, and the secret comparison it uses instead can be bypassed on installations where the secret key has never been set, allowing unauthenticated users to store arbitrary JavaScript that is executed in the browser of every site visitor.

The Adwised Web Push Notification WordPress plugin through 2.5.7 does not perform any capability or nonce check before allowing an authenticated user to overwrite its site-wide configuration, and does not escape those configuration values before printing them inside an inline script block on every front-end page, allowing any authenticated user, such as a subscriber, to perform Stored Cross-Site Scripting attacks against every visitor, including administrators.