What the vulnerability does
01Description
The Popup Box plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 6.1.1. This is due to a flawed nonce implementation in the 'publish_unpublish_popupbox' function that verifies a self-created nonce rather than one submitted in the request. This makes it possible for unauthenticated attackers to change the publish status of popups via a forged request, granted they can trick a site administrator into performing an action such as clicking a link.
Explanation of Vulnerability in Simple Terms
02Summary
The Popup Box plugin for WordPress contains a cross-site request forgery (CSRF) vulnerability in versions up to 6.1.1. An attacker can craft a malicious webpage that, when visited by a logged-in site administrator, performs unwanted actions on the site without their knowledge. The vulnerability requires the admin to visit the attacker's page but does not require the attacker to have any account or special privileges.
What an attacker can do
03Attacker Capabilities
Perform unwanted actions on the site by tricking an admin into visiting a malicious webpage.
Potential impact on your site
04Site Impact
Attackers can modify popup settings, coupon codes, or contact form configurations without authorization.
Conditions required to exploit
05Prerequisites
Site admin must visit attacker-controlled webpage while logged into WordPress.
Key dates
06Disclosure timeline
January 31, 2026
CVE published
April 8, 2026
Record updated
