What the vulnerability does
01Description
The Popup Builder – Create highly converting, mobile friendly marketing popups. plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'sg_popup' shortcode in all versions up to, and including, 4.4.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
Popup Builder versions 4.4.1 and earlier contain a stored cross-site scripting (XSS) vulnerability. An authenticated user with low privileges can inject malicious scripts that execute in the browsers of other site visitors, potentially compromising their sessions or stealing data. The vulnerability affects the entire site scope due to how the popup content is rendered.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in visitors' browsers and steals session data or credentials.
Potential impact on your site
04Site Impact
Visitor accounts and data can be compromised through malicious popups injected by low-privilege users.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account (e.g., subscriber or contributor role) on the site.
Key dates
06Disclosure timeline
December 13, 2025
CVE published
April 8, 2026
Record updated
