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Vulnerability · Published Aug 18, 2026 · Assigned by redhat

CVE-2026-66783Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref

Medium 4.4

In plain English

A medium-severity security flaw in Red Hat Advanced Cluster Management for Kubernetes 2 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 3.1)4.4Medium
Exploit odds (30 days)0.4%top 69.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 see references

Weakness: CWE-1357 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

References