CVE-2026-66651 WordPress MultiVendorX plugin <= 5.0.20 - Broken Access Control vulnerability

Q: What is CVE-2026-66651?

CVE-2026-66651 is a medium-severity missing authorization vulnerability in MultiVendorX, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Q: Is CVE-2026-66651 being exploited?

There is no known exploitation of CVE-2026-66651 in the wild and no public exploit code.

Q: How do I fix CVE-2026-66651?

No fix has been published for CVE-2026-66651 yet. Limit exposure of the affected software until one is available.

Medium 6.5 Published 18 Aug 2026 Updated 13 Oct 2026

Attackers can bypass access controls in MultiVendorX to perform unauthorized actions, requiring plugin updates.

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-2026-66651?

CVE-2026-66651 is a medium-severity missing authorization vulnerability in MultiVendorX, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Missing Authorization vulnerability in MultiVendorX MultiVendorX dc-woocommerce-multi-vendor allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MultiVendorX: from n/a through 5.0.20.

Weakness: CWE-862

Which versions are affected by CVE-2026-66651?

How do I fix CVE-2026-66651?

No fix has been published for CVE-2026-66651 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-66651 being exploited?