CVE-2026-66783
Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref
- Published
- Updated
- Reserved
- Assigned by
- redhat
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | Medium4.4 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N |
| NVDNVD · Awaiting Analysis | 3.1 | Medium4.4 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.36% · top 70% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.4.
Weakness
Affected products
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16
- unaffected 1790670243 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.16
- unaffected 1790670912 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17
- unaffected 1788105072 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17
- unaffected 1788073481 – < *
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2
All versions: affected
Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2
All versions: affected
What to do
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.
References (4)
- RHSA-2026:63016 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:85227 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-66783 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2507528 (opens in a new tab)issue-trackingx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-66783)Record last updated .