CVE-2026-17107 (GCVE-0-2026-17107)

Vulnerability from cvelistv5 – Published: 2026-07-24 18:56 – Updated: 2026-07-30 00:08
VLAI
Title
Cluster-proxy: cluster-proxy: impersonation header injection in service-proxy grants cluster-admin on every managed cluster
Summary
A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for Kubernetes (RHACM) and multicluster-engine (MCE). The service-proxy appends impersonation group headers to proxied requests without first removing caller-supplied values, and the spoke ServiceAccount holds unrestricted impersonation permissions. An authenticated hub principal can inject an Impersonate-Group header to escalate to cluster-admin on every managed cluster.
Severity
8.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:46885 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47388 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47735 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47949 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47953 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:47974 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:48284 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-17107 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2506771 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat multicluster engine for Kubernetes 2.10 Unaffected: 1784342329 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.10::el9
 Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.11 Unaffected: 1784925025 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.11::el9
 Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.17 Unaffected: 1784926298 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.17::el9
 Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.6 Unaffected: 1783985960 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.6::el9
 Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.8 Unaffected: 1784342329 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.8::el9
 Create a notification for this product.
Red Hat multicluster engine for Kubernetes 2.9 Unaffected: 1783278220 , < * (rpm)
    cpe:/a:redhat:multicluster_engine:2.9::el9
 Create a notification for this product.
Date Public
2026-07-24 18:49
Credits
Red Hat would like to thank Arpit Jain (GitHub: arpitjain099) and Kahiro Okina (Craftsman Software, Inc.) for reporting this issue.
Show details on NVD website
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2.6\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1783985960\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"multicluster-engine/cluster-proxy-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:multicluster_engine:2.8::el9\"], \"vendor\": \"Red Hat\", \"product\": \"multicluster engine for Kubernetes 2.8\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1784342329\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"multicluster-engine/cluster-proxy-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:multicluster_engine:2.9::el9\"], \"vendor\": \"Red Hat\", \"product\": \"multicluster engine for Kubernetes 2.9\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"1783278220\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"multicluster-engine/cluster-proxy-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-22T00:00:00.000Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2026-07-24T18:49:48.386Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2026-07-24T18:49:48.386Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2026:46885\", \"name\": \"RHSA-2026:46885\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:47388\", \"name\": \"RHSA-2026:47388\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:47735\", \"name\": \"RHSA-2026:47735\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:47949\", \"name\": \"RHSA-2026:47949\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:47953\", \"name\": \"RHSA-2026:47953\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:47974\", \"name\": \"RHSA-2026:47974\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2026-17107\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2506771\", \"name\": \"RHBZ#2506771\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for Kubernetes (RHACM) and multicluster-engine (MCE). The service-proxy appends impersonation group headers to proxied requests without first removing caller-supplied values, and the spoke ServiceAccount holds unrestricted impersonation permissions. An authenticated hub principal can inject an Impersonate-Group header to escalate to cluster-admin on every managed cluster.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-441\", \"description\": \"Unintended Proxy or Intermediary (\u0027Confused Deputy\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-07-29T16:41:24.469Z\"}, \"x_redhatCweChain\": \"CWE-441: Unintended Proxy or Intermediary (\u0027Confused Deputy\u0027)\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-17107\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-29T16:41:24.469Z\", \"dateReserved\": \"2026-07-24T15:28:38.469Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-07-24T18:56:05.194Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.