CVE-2026-96660

The User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Checkbox Field Value in all versions up to, and including, 5.2.8 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 nopriv AJAX action user_registration_user_form_submit reaches ur_process_registration() without nonce validation, meaning any unauthenticated request can reach the vulnerable code path.

CVSS 3.1

7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2026-10-17

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

References

• https://plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/class-ur-ajax.php#L221
• https://plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/frontend/class-ur-frontend-form-handler.php#L519
• https://plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/functions-ur-core.php#L5606
• https://plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/functions-ur-template.php#L555
• https://plugins.trac.wordpress.org/changeset/3741339/user-registration/trunk/includes/frontend/class-ur-frontend-form-handler.php

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