What the vulnerability does
01Description
The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the YouTube Video 'value' field in all versions up to, and including, 2.11.0. This is due to insufficient input sanitization and output escaping on user-supplied YouTube video URLs in the `um_profile_field_filter_hook__youtube_video()` function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject arbitrary web scripts in pages that execute whenever a user accesses the injected user's profile page.
Explanation of Vulnerability in Simple Terms
02Summary
Ultimate Member versions up to 2.11.0 contain a stored 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 user sessions or stealing sensitive data. The vulnerability affects the plugin's core functionality and impacts all site visitors, not just the vulnerable component.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and steal session data or perform actions on their behalf.
Potential impact on your site
04Site Impact
Authenticated users can inject code affecting all site visitors. Compromised user sessions and data theft are possible.
Conditions required to exploit
05Prerequisites
Attacker must have a user account on the site (low privilege level). No user interaction required from victims.
Key dates
06Disclosure timeline
December 17, 2025
CVE published
April 8, 2026
Record updated
