CVE-2026-11961 User Registration & Membership < 5.2.3 - Unauthenticated Privilege Escalation via Unbound members_data Membership ID
Unauthenticated attackers can register with arbitrary membership tiers to gain elevated roles, including administrator, in the User Registration & Membership plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11961?
CVE-2026-11961 is a high-severity vulnerability in Unknown User Registration & Membership, published on 17 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The User Registration & Membership WordPress plugin before 5.2.3 does not validate that the membership tier submitted during public registration is one of the tiers allowed by the registration form before assigning that tier's associated user role, allowing unauthenticated users to register into an arbitrary published membership tier and obtain its role — up to administrator when such a tier exists.
Weakness: CWE-269
Which versions are affected by CVE-2026-11961?
How do I fix CVE-2026-11961?
No fix has been published for CVE-2026-11961 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-11961 being exploited?
There is no known exploitation of CVE-2026-11961 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-55mp-h634-7h25.