Unauthorized Data Modification Vulnerability in User Registration & Membership Plugin for WordPress
CVE-2026-4056

5.4MEDIUM

Key Information:

Vendor

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

What is CVE-2026-4056?

The User Registration & Membership plugin for WordPress suffers from a security flaw that allows authenticated attackers, even those with only Contributor-level access, to manipulate site-wide content restriction rules. This stems from a lack of proper permission checks in the Content Access Rules REST API endpoints, specifically the check_permissions() method, which inadequately verifies user capabilities. Attackers may list, create, modify, toggle, duplicate, and delete these rules, which could lead to unauthorized content exposure or denial of access for legitimate users.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder * <= 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:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

darkestmode
JSON
.