Privilege escalation in User Registration & Membership

CVE-2026-11961

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.

Vulnerability class: Privilege Escalation

EPSS: 0.004 (31.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

  • Unknown User Registration & Membership — versions 0

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-11961?
CVE-2026-11961 is a high-severity vulnerability in User Registration & Membership, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2026-07-17.
How severe is CVE-2026-11961?
High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2026-11961 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.