CVE-2026-66878 Information disclosure in Red Hat Advanced Cluster Management for Kubernetes 2.11
Namespace administrators can exfiltrate secrets from other namespaces by manipulating channel references, leading to information disclosure in Red Hat Advanced Cluster Management.
- 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-2026-66878?
CVE-2026-66878 is a high-severity vulnerability in Red Hat Advanced Cluster Management for Kubernetes 2.11, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in multicloud-operators-subscription. A privileged user, specifically a namespace administrator capable of creating Channel and Subscription resources, can exploit this vulnerability. By manipulating the Channel.Spec.SecretRef.Namespace field, the user can cause the system to copy sensitive Secret contents from other namespaces into their own, leading to information disclosure.
Weakness: CWE-639
Which versions are affected by CVE-2026-66878?
How do I fix CVE-2026-66878?
No fix has been published for CVE-2026-66878 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66878 being exploited?
There is no known exploitation of CVE-2026-66878 in the wild and no public exploit code.
Sources
Also known as GHSA-37c6-v768-8x6w.