---
id: CVE-2026-96660
title: >-
  User Registration & Membership <= 5.2.8 - Unauthenticated Stored Cross-Site
  Scripting via Checkbox Field Value
summary: >-
  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…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: wpeverest
product: >-
  User Registration & Membership – Free & Paid Memberships, Subscriptions,
  Content Restriction, User Profile, Custom User Registration & Login Builder
affected:
  - >-
    user_registration_membership_free_paid_memberships_subscriptions_content_restriction_user_profile_custom_user_registration_login_builder
    <= 5.2.8
published: '2026-10-17'
updated: '2026-10-17'
sourceUpdated: '2026-10-17T03:43:28.389Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-96660'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/690d23ee-cf70-4ecf-8cd2-21f673788d5f?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/functions-ur-template.php#L555
  - url: >-
      https://plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/frontend/class-ur-frontend-form-handler.php#L519
  - url: >-
      https://plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/class-ur-ajax.php#L221
  - url: >-
      https://plugins.trac.wordpress.org/browser/user-registration/tags/5.2.8/includes/functions-ur-core.php#L5606
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3741339/user-registration/trunk/includes/frontend/class-ur-frontend-form-handler.php
tags:
  - cve.org
ingestedAt: '2026-10-17T03:58:44.707Z'
---

## Overview

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.

## Affected

- `user_registration_membership_free_paid_memberships_subscriptions_content_restriction_user_profile_custom_user_registration_login_builder <= 5.2.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.