CERTFR-2026-AVI-0622

Vulnerability from certfr_avis - Published: 2026-05-20 - Updated: 2026-05-20

De multiples vulnérabilités ont été découvertes dans Microsoft Windows. Elles permettent à un attaquant de provoquer une élévation de privilèges et un contournement de la politique de sécurité.

Microsoft indique qu'une preuve de concept est disponible publiquement pour la vulnérabilité CVE-2026-45585, aussi appelée YellowKey. À défaut de publier un correctif de sécurité, l'éditeur propose une mesure de contournement dans l'avis de sécurité associé (cf. section Documentation).

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products
Vendor Product Description
Microsoft N/A Windows Server 2025 (Server Core installation)
Microsoft N/A Windows Admin Center in Azure Portal versions antérieures à 0.72.0.0.
Microsoft N/A Windows Server 2025
Microsoft N/A Windows 11 version 26H1 pour systèmes x64
Microsoft N/A Windows 11 Version 24H2 pour systèmes x64
Microsoft N/A Windows 11 Version 25H2 pour systèmes x64
References

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{
  "$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
  "affected_systems": [
    {
      "description": "Windows Server 2025 (Server Core installation)",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Windows Admin Center in Azure Portal versions ant\u00e9rieures \u00e0 0.72.0.0.",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Windows Server 2025",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Windows 11 version 26H1 pour syst\u00e8mes x64",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Windows 11 Version 24H2 pour syst\u00e8mes x64",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    },
    {
      "description": "Windows 11 Version 25H2 pour syst\u00e8mes x64",
      "product": {
        "name": "N/A",
        "vendor": {
          "name": "Microsoft",
          "scada": false
        }
      }
    }
  ],
  "affected_systems_content": "",
  "content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
  "cves": [
    {
      "name": "CVE-2026-45585",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-45585"
    },
    {
      "name": "CVE-2026-42834",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42834"
    }
  ],
  "initial_release_date": "2026-05-20T00:00:00",
  "last_revision_date": "2026-05-20T00:00:00",
  "links": [],
  "reference": "CERTFR-2026-AVI-0622",
  "revisions": [
    {
      "description": "Version initiale",
      "revision_date": "2026-05-20T00:00:00.000000"
    }
  ],
  "risks": [
    {
      "description": "Contournement de la politique de s\u00e9curit\u00e9"
    },
    {
      "description": "\u00c9l\u00e9vation de privil\u00e8ges"
    }
  ],
  "summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Microsoft Windows. Elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges et un contournement de la politique de s\u00e9curit\u00e9.\n\nMicrosoft indique qu\u0027une preuve de concept est disponible publiquement pour la vuln\u00e9rabilit\u00e9 CVE-2026-45585, aussi appel\u00e9e YellowKey. \u00c0 d\u00e9faut de publier un correctif de s\u00e9curit\u00e9, l\u0027\u00e9diteur propose une mesure de contournement dans l\u0027avis de s\u00e9curit\u00e9 associ\u00e9 (cf. section Documentation).",
  "title": "Multiples vuln\u00e9rabilit\u00e9s dans Microsoft Windows",
  "vendor_advisories": [
    {
      "published_at": "2026-05-19",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft Windows CVE-2026-45585",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585"
    },
    {
      "published_at": "2026-05-19",
      "title": "Bulletin de s\u00e9curit\u00e9 Microsoft Windows CVE-2026-42834",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42834"
    }
  ]
}


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Sightings

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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.
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  • 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.



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