What the vulnerability does
01Description
The Ungapped Widgets plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'prefillvalues' parameter in the ungapped-form shortcode in all versions up to, and including, 1. This is 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 when a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
Ungapped Widgets versions 0 through 1 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts affecting other users. The vulnerability has a changed scope, meaning the impact extends beyond the vulnerable component itself. Low-privileged users can exploit this without user interaction from victims.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and modify site content or steal session data.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other users' sessions and site functionality.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account on the site; no victim interaction required.
Key dates
06Disclosure timeline
November 11, 2025
CVE published
April 8, 2026
Record updated
