What the vulnerability does
01Description
The Flipbox Addon for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Flipbox widget's button URL `custom_attributes` field in all versions up to, and including, 2.1.1 due to insufficient validation of custom attribute names. Specifically, the plugin uses `esc_html()` on the attribute name which does not prevent event handler attributes (e.g., `onmouseover`, `onclick`). This makes it possible for authenticated attackers, with author-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
The Flipbox Addon for Elementor contains a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. These scripts execute in the browsers of other site visitors, potentially compromising their sessions or stealing data. The vulnerability affects all versions up to 2.0.8. Site administrators should update to a version newer than 2.0.8 as soon as it becomes available.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and affect site functionality.
Potential impact on your site
04Site Impact
Visitor sessions and data can be compromised through scripts injected by authenticated users with low privileges.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account (e.g., contributor or subscriber) on the site.
Key dates
06Disclosure timeline
April 18, 2026
CVE published
April 20, 2026
Record updated
