Medium severity · published Aug 18, 2026
CVE-2026-66783
Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref
4.4
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
High
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Advanced Cluster Management for Kubernetes 2 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.16 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Advanced Cluster Management for Kubernetes 2.17 · Red Hat
All versions, or not specified · source: vendor
Affected product
RH
Red Hat Advanced Cluster Management for Kubernetes 2
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66783
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66783
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:63016
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:85227
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-66783
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2507528
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