CVE-2026-96270
Received Received - Intake

Stored Cross-Site Scripting in Ultimate Member WordPress Plugin

Publication date: 2026-10-03

Last updated on: 2026-10-03

Assigner: Wordfence

Description
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 'form_id' parameter in all versions up to, and including, 2.13.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload is stored in the registering user's 'submitted' usermeta via update_user_meta() and is only triggered when an administrator opens the affected user record in the wp-admin Users modal, which inserts the unescaped output via jQuery .html().

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Meta Information

Published
2026-10-03
Last Modified
2026-10-03
Generated
2026-10-03
AI Q&A
2026-10-03
EPSS Evaluated
N/A
NVD
CVE-2026-96270
EUVD
EUVD-2026-91876

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ultimate_member ultimate_member to 2.13.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Ultimate Member WordPress plugin. It allows unauthenticated attackers to inject malicious scripts via the 'form_id' parameter due to insufficient input sanitization. The payload is stored in user metadata and executes when an administrator views the affected user record in the WordPress admin panel.

Detection Guidance

To detect this vulnerability, inspect WordPress sites running the Ultimate Member plugin versions up to 2.13.1. Check for suspicious user meta entries in the database, particularly those containing script tags or unusual payloads in the 'submitted' usermeta field. Review server logs for unauthorized user registrations or unusual activity in the wp-admin Users section.

Impact Analysis

An attacker could steal session cookies, redirect users to malicious sites, or perform actions on behalf of users. The impact is limited to when an administrator accesses the compromised user record, but the stored payload persists until removed.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles or HIPAA's safeguards for protected health information. It may result in non-compliance if exploited.

Mitigation Strategies

Immediately update the Ultimate Member plugin to the latest version beyond 2.13.1. If an update is unavailable, consider disabling the plugin temporarily. Review all user accounts for injected scripts in the 'submitted' usermeta field and remove any malicious entries. Implement strict input validation and output escaping for user-submitted data.

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