CVE-2026-11964 — CRITICAL (9.1)

Vulnerability Description

The User Registration & Membership WordPress plugin before 5.2.2 does not verify the authenticity of incoming payment-provider webhook notifications before acting on them, allowing unauthenticated attackers to forge a payment-approved event and activate a paid membership subscription without completing a real payment.

CVSS Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

References

https://wpscan.com/vulnerability/faf55649-8f76-4abf-a6b9-0d0774e22d29/

FAQ

What is CVE-2026-11964?

CVE-2026-11964 is a vulnerability with a CVSS score of 9.1 (CRITICAL). The User Registration & Membership WordPress plugin before 5.2.2 does not verify the authenticity of incoming payment-provider webhook notifications before acting on them, allowing unauthenticated at...

How severe is CVE-2026-11964?

CVE-2026-11964 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-11964?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.