Medium · published April 7, 2026
The Popup Box WordPress plugin before 5.5.0 does not properly validate nonces in the add_or_edit_popupbox() function before saving popup data, allowing unauthenticated attackers to perform Cross-Site Request Forgery attacks. When an authenticated admin visits a malicious page, the attacker can create or modify popups with arbitrary JavaScript that executes in the admin panel and frontend.
| Product | Versions | Fixed in |
|---|---|---|
| ays-pro/popup_box | < 5.5.0 | 5.5.0 |