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CVE-2026-66783— Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref

Quick assessment

Affected
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Submariner Operator是Submariner团队开源的一个提供跨集群网络连接能力的网络产品。 Submariner Operator存在输入验证错误漏洞，该漏洞源于submariner-operator组件未对镜像路径进行充分验证，可能导致具有修改Submariner自定义资源权限的集群管理员或用户部署恶意镜像，从而在包括控制平面节点在内的整个集群中执行任意代码并提升权限。

CVSS 4.4 · Medium EPSS 0.35% · P27

Affected Version Matrix 4

VendorProduct Version RangeStatus
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 any affected
any affected
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1788105072< * unaffected
1788073481< * unaffected
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I. Basic Information for CVE-2026-66783

Vulnerability Information
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Vulnerability Title
Submariner-operator: release workflow consumes same-org composite action via mutable @devel branch ref
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1357
Source: CVE Program / CVE List V5
Vulnerability Title
Submariner Operator 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Submariner Operator是Submariner团队开源的一个提供跨集群网络连接能力的网络产品。 Submariner Operator存在输入验证错误漏洞，该漏洞源于submariner-operator组件未对镜像路径进行充分验证，可能导致具有修改Submariner自定义资源权限的集群管理员或用户部署恶意镜像，从而在包括控制平面节点在内的整个集群中执行任意代码并提升权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1788105072 ~ * cpe:/a:redhat:acm:2.17::el9
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.17 1788073481 ~ * cpe:/a:redhat:acm:2.17::el9
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 - cpe:/a:redhat:acm:2
Red Hat Red Hat Advanced Cluster Management for Kubernetes 2 - cpe:/a:redhat:acm:2

II. Public POCs for CVE-2026-66783

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III. Intelligence Information for CVE-2026-66783

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Vendor Advisories for CVE-2026-66783 (3)

Same Patch Batch · Red Hat · 2026-08-18 · 14 CVEs total

CVE-2026-12564 9.6 CRITICAL Automation-controller: automation-controller: kubernetes service account token exfiltratio
CVE-2026-18963 9.1 CRITICAL Keycloak-services: keycloak-services: unauthenticated account takeover via reset-credentia
CVE-2026-66793 8.8 HIGH Governance-policy-addon-controller: governance-policy-addon-controller: arbitrary containe
CVE-2026-75924 8.7 HIGH Managed-serviceaccount: managed-serviceaccount: hub addon-manager clusterrole grants clust
CVE-2026-71365 7.7 HIGH Awx: webhook status callback ssrf leaks the git pat
CVE-2026-15571 7.3 HIGH Keycloak-services: keycloak-services: predictable account-linking hash enables account tak
CVE-2026-66780 6.5 MEDIUM Submariner-operator: broker serviceaccount secret (token + ca) logged in full at trace ver
CVE-2026-75032 6.3 MEDIUM Bluez: bluez: out-of-bounds read in avrcp parse_media_element and parse_media_folder
CVE-2026-66782 5.8 MEDIUM Submariner-operator: operator clusterrole grants cluster-wide create/update on all configm
CVE-2026-75485 5.5 MEDIUM Must-gather: /tmp/kubeconfig retention
CVE-2026-73834 5.5 MEDIUM Must-gather: must-gather: embedded secret data in acm wrapper crs collected without redact
CVE-2026-66781 5.4 MEDIUM Submariner-operator: pprof debug endpoint enabled by default on 0.0.0.0:8082 without authe
CVE-2026-19608 5.3 MEDIUM Keycloak-services: keycloak-services: name-only group claims let same-name groups satisfy

IV. Related Vulnerabilities

Same product: Red Hat Advanced Cluster Management for Kubernetes 2.17
Same vendor: Red Hat
Same weakness: CWE-1357

V. Comments for CVE-2026-66783

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