The User Registration & Membership plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the Content Access Rules REST API endpoints in versions 5.0.1 through 5.1.4. This is due to the `check_permissions()` method only checking for `edit_posts` capability instead of an administrator-level capability. This makes it possible for authenticated attackers, with Contributor-level access and above, to list, create, modify, toggle, duplicate, and delete site-wide content restriction rules, potentially exposing restricted content or denying legitimate user access.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://plugins.trac.wordpress.org/browser/user-registration/tags/5.1.1/modules…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/user-registration/trunk/modules/cont…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset/3485702/user-registration/trunk/mo…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/7bb5a5a2-9644-4850-a5…
security@wordfence.com