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CVE-2026-4740

A flaw was found in Open Cluster Management (OCM), the technology underlying Red Hat Advanced Cluster Management (ACM). Improper validation of Kubernetes client certificate renewal allows a managed cluster administrator to forge a client certificate that can be approved by the OCM controller. This enables cross-cluster privilege escalation and may allow an attacker to gain control over other managed clusters, including the hub cluster.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6c8f542cdcc370c86a00d79ae78bab24600bf34e596b5bcc36428f0e151b29f4
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 14 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/registration-operator-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/4

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/work-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/6

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/registration-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/5

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/registration-operator-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/4

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/maestro-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/addon-manager-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/placement-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/3

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/maestro-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/placement-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/3

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/managedcluster-import-controller-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/2

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/work-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/6

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/registration-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/5

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/managedcluster-import-controller-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/2

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/addon-manager-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/0

Affected products and versions

14 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/registration-operator-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/4
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/work-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/6
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/registration-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/5
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/registration-operator-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/4
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/maestro-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/addon-manager-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/placement-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/3
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/maestro-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/placement-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/3
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/managedcluster-import-controller-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/2
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/work-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/6
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/registration-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/5
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/managedcluster-import-controller-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/affected/2
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:multicluster_engine"],"defaultStatus":"unknown","packageName":"multicluster-engine/addon-manager-rhel9","product":"Multicluster Engine for Kubernetes","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-295","description":"Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-295","description":"Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/problemTypes/0/descriptions/0

Source references

6 source assertions
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-4740"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/references/0
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-4740"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/references/0
{"url":"https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/references/1
{"name":"RHBZ#2450590","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2450590"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/references/1
{"name":"RHBZ#2450590","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2450590"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/cna/references/2
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4740.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f74e8c6835d6c58674cd93b3fe5c490daf2826b8e23becef3c50976b38460293 · sha256:7e8d2fec7774c931… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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