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CVE-2026-101919— Hypershift: hypershift: unsanitized kubeconfig passthrough from tenant namespace to control plane

Quick assessment

Affected
Red Hat Multicluster Engine for Kubernetes
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.

发现 HyperShift 算子（operator）存在一个安全缺陷。该算子会直接将用户提供的 Kubernetes 配置（kubeconfig）密钥复制到权限较高的控制平面命名空间中，而未进行充分的验证或清理。拥有集群和密钥创建权限的经过身份验证的用户，可以通过提供包含未授权可执行插件的配置来利用此漏洞。当下游控制器消费该配置时，攻击者即可在控制平面中实现任意代码执行。

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Red Hat Multicluster Engine for Kubernetes any affected
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I. Basic Information for CVE-2026-101919

Vulnerability Information
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Vulnerability Title
Hypershift: hypershift: unsanitized kubeconfig passthrough from tenant namespace to control plane
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the HyperShift operator. The operator copies user-provided Kubernetes configuration (kubeconfig) secrets directly into the privileged control plane namespace without proper validation or sanitization. An authenticated user with cluster and secret creation permissions can exploit this vulnerability by supplying a configuration containing unauthorized executable plugins. When downstream controllers consume this configuration, an attacker can achieve arbitrary code execution within the control plane.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Multicluster Engine for Kubernetes - cpe:/a:redhat:multicluster_engine

II. Public POCs for CVE-2026-101919

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III. Intelligence Information for CVE-2026-101919

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Vendor Advisories for CVE-2026-101919 (2)

Same Patch Batch · Red Hat · 2026-10-05 · 13 CVEs total

CVE-2026-71299 6.5 MEDIUM Maestro: maestro: rest api write endpoints registered without authentication middleware
CVE-2026-105306 6.5 MEDIUM Keycloak-services: keycloak-services: token introspection audience bypass via dynamic clie
CVE-2026-71298 6.4 MEDIUM Maestro: sql identifier injection via properties.* search filter and orderby field
CVE-2026-105302 5.7 MEDIUM Keycloak-services: keycloak-services: user session note mapper exposes upstream idp access
CVE-2026-105447 5.5 MEDIUM Quay: quay: global read-only superuser can access build trigger write credentials
CVE-2026-104030 5.5 MEDIUM Sssd: sssd: denial of service via out-of-bounds read during passkey parsing
CVE-2026-71297 5.4 MEDIUM Maestro: maestro: grpc broker has no auth interceptor and client mtls is optional
CVE-2026-102295 5.4 MEDIUM Quay: quay: dom-based cross-site scripting via oauth local callback format=json parameter
CVE-2026-102576 4.2 MEDIUM Quay: quay: dom-based cross-site scripting via unvalidated redirect_url on signin page
CVE-2026-105301 4.0 MEDIUM Keycloak-services: keycloak-services: blind ssrf via x.509 authenticator fetching attacker
CVE-2026-104029 3.3 LOW Sssd: sssd: denial of service via out-of-bounds read in autofs responder
CVE-2026-105326 2.5 LOW Cups: cups: argument injection in mailto notifier via notify-recipient-uri

IV. Related Vulnerabilities

Same product: Multicluster Engine for Kubernetes
Same vendor: Red Hat
Same weakness: CWE-20

V. Comments for CVE-2026-101919

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