CVE-2026-66689 WordPress Anti Spam and list cleaner – AcyChecker plugin <= 2.0.0 - Broken Access Control vulnerability

Q: What is CVE-2026-66689?

CVE-2026-66689 is a medium-severity missing authorization vulnerability in AcyMailing Newsletter Team Anti Spam and list cleaner – AcyChecker, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Q: Is CVE-2026-66689 being exploited?

There is no known exploitation of CVE-2026-66689 in the wild and no public exploit code.

Q: How do I fix CVE-2026-66689?

No fix has been published for CVE-2026-66689 yet. Limit exposure of the affected software until one is available.

Medium 6.3 Published 13 Aug 2026 Updated 13 Aug 2026

Unauthenticated attackers can bypass access controls in the AcyChecker WordPress plugin, potentially accessing restricted functionality.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-66689?

CVE-2026-66689 is a medium-severity missing authorization vulnerability in AcyMailing Newsletter Team Anti Spam and list cleaner – AcyChecker, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Unauthenticated Broken Access Control in Anti Spam and list cleaner – AcyChecker <= 2.0.0 versions.

Weakness: CWE-862

Which versions are affected by CVE-2026-66689?

How do I fix CVE-2026-66689?

No fix has been published for CVE-2026-66689 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-2026-66689 being exploited?