CVE-2026-66785 Missing authorization in Red Hat Advanced Cluster Management for Kubernetes 2
A malicious cluster can hijack cross-cluster traffic by publishing unvalidated network endpoints, leading to information disclosure or disruption.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66785?
CVE-2026-66785 is a high-severity missing authorization vulnerability in Red Hat Advanced Cluster Management for Kubernetes 2, published on 20 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A flaw was found in Submariner. This vulnerability allows a malicious cluster (spoke) to redirect network traffic from other connected clusters (peer clusters) by publishing a specially crafted network endpoint. The system fails to properly validate the network subnets provided by the malicious cluster, enabling it to declare arbitrary network ranges. Consequently, all network traffic intended for these arbitrary ranges from peer clusters will be rerouted through the attacker's tunnel, potentially leading to unauthorized information disclosure or network disruption.
Weakness: CWE-345
Which versions are affected by CVE-2026-66785?
How do I fix CVE-2026-66785?
No fix has been published for CVE-2026-66785 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-2026-66785 being exploited?
There is no known exploitation of CVE-2026-66785 in the wild and no public exploit code.
Sources
Also known as GHSA-37mq-728j-5q43.