What’s Vulnerable › Vulnerabilities
CVE-2026-11961: User Registration & Membership < 5.2.3 - Unauthenticated Privilege Escalation via Unbound members_data Membership ID
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-17 · updated 2026-07-17
- Weakness: CWE-269
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.
Affected products
- User Registration & Membership: before 5.2.3 — fixed in 5.2.3
How to fix
Upgrade to a fixed version: User Registration & Membership 5.2.3. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-11961 or the next vulnerability affects your stack