CVE-2026-11964 Business logic in User Registration & Membership
Unauthenticated attackers can forge PayPal webhook notifications to bypass payment verification and activate paid membership subscriptions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11964?
CVE-2026-11964 is a critical vulnerability in Unknown User Registration & Membership, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-11964?
How do I fix CVE-2026-11964?
No fix has been published for CVE-2026-11964 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-11964 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-11964 exists.
Sources
Also known as GHSA-6f2x-47pc-8mpq.