---
id: CVE-2026-66783
title: >-
  Submariner-operator: release workflow consumes same-org composite action via
  mutable @devel branch ref
summary: >-
  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),…
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-1357
vendor: Red Hat
product: rhacm2/subctl-rhel9
affected:
  - rhacm2/subctl-rhel9 (all versions)
  - rhacm2/submariner-rhel9-operator (all versions)
  - rhacm2/subctl-rhel9 (all versions)
  - rhacm2/submariner-rhel9-operator (all versions)
  - rhacm2/submariner-addon-rhel9 (all versions)
  - rhacm2/submariner-operator-bundle (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-19T15:04:32.835125Z'
published: '2026-08-18'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T17:02:18.781Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-66783'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:63016'
    label: 'RHSA-2026:63016'
  - url: 'https://access.redhat.com/errata/RHSA-2026:85227'
    label: 'RHSA-2026:85227'
  - url: 'https://access.redhat.com/security/cve/CVE-2026-66783'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2507528'
    label: RHBZ#2507528
tags:
  - cve.org
epss: 0.00351
epssPercentile: 0.27261
ingestedAt: '2026-10-19T17:33:42.453Z'
---

## Overview

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

- `rhacm2/subctl-rhel9 (all versions)`
- `rhacm2/submariner-rhel9-operator (all versions)`
- `rhacm2/subctl-rhel9 (all versions)`
- `rhacm2/submariner-rhel9-operator (all versions)`
- `rhacm2/submariner-addon-rhel9 (all versions)`
- `rhacm2/submariner-operator-bundle (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

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.