CVE-2026-11964

Critical · 9.1

CVSS

9.1

EPSS

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Published

Jul 13, 2026

CISA due date

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The record

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.

Affected packages

Ecosystem	Package	Introduced	Fixed