CVE-2026-11964
Critical
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductUser Registration & Membership
PublishedJul 13, 2026
First seenJul 13, 2026
Weakness typeCWE-287Improper authentication
How to fix
Update
- User Registration & Membership5.2.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| User Registration & Membership | v < 5.2.2 | 5.2.2 |
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