What the vulnerability does
01Description
The User Registration & Membership – Custom Registration Form, Login Form, and User Profile plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 5.1.2 via the 'register_member' function, due to missing validation on the 'member_id' user controlled key. This makes it possible for unauthenticated attackers to delete arbitrary user accounts that newly registered on the site who has the 'urm_user_just_created' user meta set.
Explanation of Vulnerability in Simple Terms
02Summary
The User Registration & Membership plugin for WordPress contains an access control flaw affecting versions up to 5.1.2. An attacker without authentication can modify certain data on the site. The vulnerability requires no user interaction and is exploitable over the network. Site administrators should update to a version newer than 5.1.2.
What an attacker can do
03Attacker Capabilities
Modify data on the site without logging in.
Potential impact on your site
04Site Impact
Unauthorized users can alter site content or settings depending on what the plugin exposes.
Conditions required to exploit
05Prerequisites
Network access only; no authentication or user interaction required.
Key dates
06Disclosure timeline
February 26, 2026
CVE published
April 8, 2026
Record updated
