Unauthorized Data Modification in User Registration Plugin for WordPress
CVE-2026-3601

4.3MEDIUM

Key Information:

Vendor

WordPress
Status
User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
Vendor
CVE Published:
5 May 2026

What is CVE-2026-3601?

The User Registration & Membership plugin for WordPress contains a vulnerability that allows authenticated users with Contributor-level access and above to modify data without permission due to inadequate capability checks in the embed_form_action() function. This vulnerability affects all versions up to and including 5.1.4. As a result, attackers can append shortcode content to pages they do not own, potentially compromising the integrity of the site.

Affected Version(s)

User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder 0 <= 5.1.4

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/user-registrat...
https://plugins.trac.wordpress.org/browser/user-registrat...

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Hunter Jensen
.