User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder <= 5.2.8 - Authenticated (Subscriber+) Stored Cross-Site Scripting via Checkbox Field Value

ID

WPSEC-2026-0823

Plugin

User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder (user-registration)

Affected

all versions before 5.3.0

Remediation

Update to 5.3.0 or later.

CVSS 3.1

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

Weakness

CWE-79

Usage

Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-13

Attack surface

User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder on WPSec AttackSurface

Fix released

2026-10-12

Published

2026-10-13

Description

The User Registration & Membership plugin for WordPress is vulnerable to Stored Cross-Site Scripting via checkbox form field values in all versions up to, and including, 5.2.8. The user_registration_form_field() function writes the user-controlled stored value into the data-value attribute without escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts. The scripts execute whenever a user, including an administrator, views a page that renders the affected profile field.

References

• https://wpsec.com/vuln/WPSEC-2026-0823/
• https://plugins.svn.wordpress.org/user-registration/tags/5.3.0/
• https://wordpress.org/plugins/user-registration/

Published by WPSec. Provided as is, without warranty. Corrections: contact us.

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