WordPress · User Registration & Membership – Custom Registration Form Builder · CVE-2026-2356
**Name of the Vulnerable Software and Affected Versions**
User Registration & Membership – Custom Registration Form, Login Form, and User Profile versions prior to 5.1.3
**Description**
The User Registration & Membership – Custom Registration Form, Login Form, and User Profile plugin for WordPress contains a flaw due to missing validation on the `member id` user-controlled key within the `register member` function. This insecure direct object reference allows unauthenticated attackers to delete arbitrary user accounts that recently registered on the site and have the `urm user just created` user meta set.
**Recommendations**
Update User Registration & Membership – Custom Registration Form, Login Form, and User Profile to version 5.1.3 or later.