What the vulnerability does
01Description
The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode attributes in all versions up to, and including, 2.11.0 due to insufficient input sanitization and output escaping. 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
Ultimate Member versions up to 2.11.0 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. The vulnerability has a changed scope, meaning injected code can affect other users or site functionality beyond the vulnerable component. An attacker with a low-privilege account can exploit this without user interaction to compromise other site visitors.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers or affect site functionality.
Potential impact on your site
04Site Impact
Authenticated users can inject code affecting other visitors or site operations; data theft or malware distribution possible.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege user account on the site; no user interaction required.
Key dates
06Disclosure timeline
December 21, 2025
CVE published
April 8, 2026
Record updated
