What the vulnerability does
01Description
The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the filter parameters (e.g., 'filter_first_name') in all versions up to, and including, 2.11.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Explanation of Vulnerability in Simple Terms
02Summary
Ultimate Member versions up to 2.11.1 contain a cross-site scripting (XSS) vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. The vulnerability requires user interaction—typically clicking a malicious link—and can affect users across the site. An attacker with no authentication can craft a payload that executes in victims' browsers, potentially stealing session data or performing actions on their behalf.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in other users' browsers when they visit a crafted link.
Potential impact on your site
04Site Impact
Users' sessions and data can be compromised if they click malicious links; site reputation and user trust at risk.
Conditions required to exploit
05Prerequisites
Victim must click a malicious link or visit an attacker-controlled page; no authentication required.
Key dates
06Disclosure timeline
February 18, 2026
CVE published
April 8, 2026
Record updated
