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Full vulnerability report · 2026
CVE-2026-66783High confidence

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

Red Hat · Red Hat Advanced Cluster Management for Kubernetes 2.17

Official source article: Red Hat RHSA-2026:63016 ↗. Check the applicable product and release in the original source.

4.4MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.35% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-66783 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysubmariner-operator: Release workflow consumes same-org composite action via mutable @devel branch ref
2 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • rhacm2/submariner-addon-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2
  • rhacm2/submariner-operator-bundle as a component of Red Hat Advanced Cluster Management for Kubernetes 2
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.
Remediation
For release note details, see the upstream Submariner release notes: https://submariner.io/community/releases/ Downstream-specific issues resolved: * ACM-30182 * ACM-32385 * ACM-34578 * ACM-34651 * ACM-34693 * ACM-36281 * ACM-36898 * ACM-36899 * ACM-36907 * ACM-36909 * ACM-36910 * ACM-36911 * ACM-36912 * ACM-36927 * ACM-38289 * ACM-38295 * ACM-38315 * ACM-38320 * ACM-38322 * ACM-38330 * ACM-38357 * ACM-38360 * ACM-38447 * ACM-38448 * ACM-38449 * ACM-38450 * ACM-38451 * ACM-38452 * ACM-38453 * ACM-38466 * ACM-38494 * ACM-38495 * ACM-38496 * ACM-38497 * ACM-38499 * ACM-38500 * ACM-38513 * ACM-38515 * ACM-38519 * ACM-38520 * ACM-38533 * ACM-38538 * ACM-38542 * ACM-38546 * ACM-39374 * ACM-39382 * ACM-39384 * ACM-39385 * ACM-39510 * ACM-39511 * ACM-39568 * ACM-40464 * ACM-41039 * ACM-42640 For more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.17/
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-61067

No EUVD known-exploited evidence

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.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
4.4 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

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.

What

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.

Why

The product is built from multiple separate components, but it uses a component that is not sufficiently trusted to meet expectations for security, reliability, updateability, and maintainability.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may execute code or commands in the affected security context.

What

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.

Why

The product is built from multiple separate components, but it uses a component that is not sufficiently trusted to meet expectations for security, reliability, updateability, and maintainability.

How

An attacker operating through a network path may attempt exploitation with elevated privileges. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Reliance on Insufficiently Trustworthy Component → execute code or commands in the affected security context
Attack surface
Network
Privileges required
High: elevated access is required
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-1357 ↗

CWE-1357: Reliance on Insufficiently Trustworthy Component. The product is built from multiple separate components, but it uses a component that is not sufficiently trusted to meet expectations for security, reliability, updateability, and maintainability.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRHighPrivileges required: The attacker needs elevated or administrative privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
NetworkRemote code executionPrivilege escalationCWE-1357
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-61067Official EUVD mapping

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.

Official EUVD record ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
For release note details, see the upstream Submariner release notes: https://submariner.io/community/releases/ Downstream-specific issues resolved: * ACM-30182 * ACM-32385 * ACM-34578 * ACM-34651 * ACM-34693 * ACM-36281 * ACM-36898 * ACM-36899 * ACM-36907 * ACM-36909 * ACM-36910 * ACM-36911 * ACM-36912 * ACM-36927 * ACM-38289 * ACM-38295 * ACM-38315 * ACM-38320 * ACM-38322 * ACM-38330 * ACM-38357 * ACM-38360 * ACM-38447 * ACM-38448 * ACM-38449 * ACM-38450 * ACM-38451 * ACM-38452 * ACM-38453 * ACM-38466 * ACM-38494 * ACM-38495 * ACM-38496 * ACM-38497 * ACM-38499 * ACM-38500 * ACM-38513 * ACM-38515 * ACM-38519 * ACM-38520 * ACM-38533 * ACM-38538 * ACM-38542 * ACM-38546 * ACM-39374 * ACM-39382 * ACM-39384 * ACM-39385 * ACM-39510 * ACM-39511 * ACM-39568 * ACM-40464 * ACM-41039 * ACM-42640 For more details, see the Red Hat Advanced Cluster Management for Kubernetes documentation: https://docs.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.17/
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 18 Aug 2026 · Last source change 3 Sept 2026, 04:41 UTC · CWE-1357 · Reliance on Insufficiently Trustworthy Component

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-23
European sourceENISA EUVD · EUVD-2026-61067
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:63016.
    Before
    no authoritative guidance recorded
    After
    remediation: access.redhat.com/RHSA-2026:63016
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Advanced Cluster Management for Kubernetes 2.17: 1788105072 < *, 1788073481 < *
    CNA ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    CNA ↗
  4. SeveritySeverity changed from High to Medium.
    Before
    High
    After
    Medium
    CNA ↗
  5. CVSS scoreCVSS score changed from 8.2 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H) to 4.4 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N).
    Before
    8.2 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
    After
    4.4 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N)
    CNA ↗
  6. Vendor guidanceAuthoritative vendor guidance changed: removed vendor advisory: access.redhat.com/RHSA-2026:63016.
    Before
    remediation: access.redhat.com/RHSA-2026:63016 · vendor advisory: access.redhat.com/RHSA-2026:63016
    After
    remediation: access.redhat.com/RHSA-2026:63016
    CNA ↗
  7. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:63016; added vendor advisory: access.redhat.com/RHSA-2026:63016.
    Before
    no authoritative guidance recorded
    After
    remediation: access.redhat.com/RHSA-2026:63016 · vendor advisory: access.redhat.com/RHSA-2026:63016
    access.redhat.com ↗
  8. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    See the vendor and CVE records for the affected range. · Fixed: 1788105072 < *; 1788073481 < *
    CNA ↗
  9. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    access.redhat.com ↗
  10. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-66783 to remediation: access.redhat.com/CVE-2026-66783.
    Before
    remediation: access.redhat.com/CVE-2026-66783
    After
    remediation: access.redhat.com/CVE-2026-66783
    Red Hat Product Security ↗
  11. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Red Hat Product Security ↗
  12. Affected versionsThe structured affected or fixed version information changed.
    Before
    rhacm2/subctl-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-addon-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-operator-bundle as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-rhel9-operator as a component of Red Hat Advanced Cluster Management for Kubernetes 2
    After
    rhacm2/submariner-addon-rhel9 as a component of Red Hat Advanced Cluster Management for Kubernetes 2; rhacm2/submariner-operator-bundle as a component of Red Hat Advanced Cluster Management for Kubernetes 2 · Fixed: registry.redhat.io/rhacm2/subctl-rhel9@sha256:1b38ba10de27535bc6e76dac4db2e66b95e7c666f20136c15d7ac11531c541df_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/subctl-rhel9@sha256:a8f500a30142993b8d07f4ed5b29007d89c6edc09ece1bbd72b4467e1a504c6b_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/subctl-rhel9@sha256:d5ff003a3893554a20712a9aebda49be7a6e83594ecc5fd8bb898567734c86b8_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/subctl-rhel9@sha256:fb5fdb72a0f7d4b8555359d506eebd63d10713a2fd24b5a3669554155f620c62_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-rhel9-operator@sha256:0714135f3594b0e42c4d185779b3a716fc98c6bc35135aa6dec2c9730c93ae52_s390x as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-rhel9-operator@sha256:1c0fe9629265844d3cd36fa6fd358026087240dee118e1d438f3ac273f427054_amd64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-rhel9-operator@sha256:5d1225146756be65df394eeb2ec2afa87b025b6e5bfbc9ddd89eaff47d5a40d8_ppc64le as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17; registry.redhat.io/rhacm2/submariner-rhel9-operator@sha256:93850d48fc8efac7bc3630e4102f5471bcf84921a31c17bc1512e77a4602fc36_arm64 as a component of Red Hat Advanced Cluster Management for Kubernetes 2.17
    Red Hat Product Security ↗
  13. SeveritySeverity changed from Unknown to Medium.
    Before
    Unknown
    After
    Medium
    CNA ↗
  14. CVSS scoreCVSS score changed from not recorded to 4.4 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N).
    Before
    not recorded
    After
    4.4 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N)
    CNA ↗
  15. SeveritySeverity changed from High to Unknown.
    Before
    High
    After
    Unknown
    CVE.org ↗
  16. CVSS scoreCVSS score changed from 8.2 (CVSS 3.1 · Other authority · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H) to not recorded.
    Before
    8.2 (CVSS 3.1 · Other authority · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
    After
    not recorded
    CVE.org ↗
  17. CVSS scoreCVSS scoring authority changed from CNA to Other authority; the displayed base score remained 8.2.
    Before
    8.2 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
    After
    8.2 (CVSS 3.1 · Other authority · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
    Other authority ↗
  18. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: access.redhat.com/RHSA-2026:63016.
    Before
    remediation: access.redhat.com/RHSA-2026:63016
    After
    no authoritative guidance recorded
    CNA ↗
  19. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 1788105072 < *; 1788073481 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  20. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    CNA ↗
  21. SeveritySeverity changed from Medium to High.
    Before
    Medium
    After
    High
    CNA ↗
  22. CVSS scoreCVSS score changed from 4.4 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N) to 8.2 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H).
    Before
    4.4 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N)
    After
    8.2 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)
    CNA ↗
  23. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-61067↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:63016↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-66783 · cve.blacktree.nl