CVE-2026-11963 User Registration & Membership < 5.2.2 - Subscriber+ Cross-User Role and Membership Tier Modification via IDOR
Authenticated users can modify other users' roles and membership tiers due to missing authorization checks in the User Registration & Membership plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11963?
CVE-2026-11963 is a high-severity missing authorization vulnerability in Unknown User Registration & Membership, published on 13 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The User Registration & Membership WordPress plugin before 5.2.2 does not perform an authorization check on a membership-upgrade action and derives the user to modify from a caller-supplied identifier instead of the current user, allowing any authenticated user such as a subscriber to change another user's WordPress role and membership tier.
Which versions are affected by CVE-2026-11963?
How do I fix CVE-2026-11963?
No fix has been published for CVE-2026-11963 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-11963 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-11963 exists.
Sources
Also known as GHSA-qxg2-gwhj-546g.