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.
| Software Type | Plugin |
|---|---|
| Software Slug |
user-registration
View on wordpress.org
|
| CVE | CVE-2026-4056 |
| Patched Versions |
5.1.5
|
| Affected Versions |
*-5.1.4
|
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