CVE-2026-66783

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

Published Aug 18, 2026 CVSS 3.1 · 4.4 Medium EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Workaround

To mitigate this issue, restrict access to cluster-admin roles and carefully control permissions for users or service accounts that can modify Submariner Custom Resources. Ensure that only trusted and authorized personnel have the ability to patch Submariner CRs, thereby preventing the injection of malicious images.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Submariner-operator: submariner-operator: arbitrary image override enables privileged code execution on every node Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref
Weaknesses CWE-1357
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N'}

Type Values Removed Values Added
First Time appeared Redhat advanced Cluster Management For Kubernetes
Vendors & Products Redhat advanced Cluster Management For Kubernetes
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Submariner-operator: submariner-operator: arbitrary image override enables privileged code execution on every node
First Time appeared Redhat
Redhat acm
Weaknesses CWE-20
CPEs cpe:/a:redhat:acm:2
Vendors & Products Redhat
Redhat acm
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Oct 19, 2026, 5:02 PM
Reserved
Jul 27, 2026, 5:51 PM
Status
Awaiting Analysis
Published
Aug 18, 2026, 5:17 PM
Modified
Oct 19, 2026, 5:17 PM
Severity
Important
Public date
Aug 18, 2026, 4:35 PM