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Fencer Vulns
medium 4.4

CVE-2026-66783 json

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

published 2026-08-18 2 mo ago modified 2026-10-19 20 d ago also EUVD-2026-61067

cvss
4.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

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), 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.

Patch / fix

  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16 1790670243, 1790670912
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1788073481, 1788105072

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-66783 updated cvss 4.4

submariner-operator: Release workflow consumes same-org composite action via mutable @devel branch ref

  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/submariner-addon-rhel9, rhacm2/submariner-operator-bundle
    affected: workaround, no fix available
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/subctl-rhel9 1790670243, rhacm2/submariner-rhel9-operator 1790670912
    fixed: vendor fix RHSA-2026:85227
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/subctl-rhel9 1788105072, rhacm2/submariner-rhel9-operator 1788073481
    fixed: vendor fix RHSA-2026:63016
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 rhacm2/nettest-rhel9 1790702141, rhacm2/lighthouse-agent-rhel9 1790670439, rhacm2/lighthouse-coredns-rhel9 1790670231, rhacm2/submariner-gateway-rhel9 1790670508, rhacm2/submariner-globalnet-rhel9 1790670233, rhacm2/submariner-operator-bundle 1790750775, +1 more Red Hat Advanced Cluster Management for Kubernetes 2.17 rhacm2/nettest-rhel9 1788166791, rhacm2/lighthouse-agent-rhel9 1788023916, rhacm2/lighthouse-coredns-rhel9 1788023940, rhacm2/submariner-gateway-rhel9 1788043964, rhacm2/submariner-globalnet-rhel9 1788043961, rhacm2/submariner-operator-bundle 1788217593, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.4 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

Affected products

  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2

Classification

Weakness
  • CWE-1357 Reliance on Insufficiently Trustworthy Component

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.