CVE-2026-66783 Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref
Attackers can execute arbitrary code with elevated privileges by specifying unvalidated image paths in Submariner Custom Resources.
- 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-2026-66783?
CVE-2026-66783 is a medium-severity vulnerability in Red Hat Advanced Cluster Management for Kubernetes 2, published on 18 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A flaw was found in the `submariner-operator` component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability allows a cluster administrator, or any user with permissions to modify the Submariner Custom Resource (CR), to specify an unvalidated image path. This lack of validation enables an attacker to execute arbitrary code with elevated privileges across the entire cluster, including control-plane nodes, by deploying a malicious image.
Weakness: CWE-1357
Which versions are affected by CVE-2026-66783?
How do I fix CVE-2026-66783?
No fix has been published for CVE-2026-66783 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66783 being exploited?
There is no known exploitation of CVE-2026-66783 in the wild and no public exploit code.
Sources
Also known as GHSA-95w2-696m-24mq.