{
  "$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"
    }
  ]
}

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*",
              "matchCriteriaId": "1799DC19-34BA-42B4-A6DC-02774202DE22",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*",
              "matchCriteriaId": "AAAB3FDE-4FF2-47DE-9BDA-25B2855054E7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*",
              "matchCriteriaId": "DA9F6F61-46D3-4ECD-8B5D-1484222B7364",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "9B12238F-DF99-4247-B645-259C3FD98F61",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Microsoft is aware of a security feature bypass vulnerability in Windows publicly referred to as \u0026quot;YellowKey\u0026quot;. The proof of concept for this vulnerability has been made public violating coordinated vulnerability best practices.\nWe are issuing this CVE to provide mitigation guidance that can be implemented to protect against this vulnerability until the security update is made available."
    }
  ],
  "id": "CVE-2026-45585",
  "lastModified": "2026-05-20T16:42:42.177",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "PHYSICAL",
          "availabilityImpact": "HIGH",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 0.9,
        "impactScore": 5.9,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-20T00:16:44.380",
  "references": [
    {
      "source": "secure@microsoft.com",
      "tags": [
        "Vendor Advisory",
        "Mitigation"
      ],
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/Nightmare-Eclipse/YellowKey"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-77"
        }
      ],
      "source": "secure@microsoft.com",
      "type": "Secondary"
    }
  ]
}

{
  "affected": [],
  "aliases": [
    "CVE-2026-45585"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-77"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-20T00:16:44Z",
    "severity": "MODERATE"
  },
  "details": "Microsoft is aware of a security feature bypass vulnerability in Windows publicly referred to as \u0026quot;YellowKey\u0026quot;. The proof of concept for this vulnerability has been made public violating coordinated vulnerability best practices.\nWe are issuing this CVE to provide mitigation guidance that can be implemented to protect against this vulnerability until the security update is made available.",
  "id": "GHSA-2h24-8rjh-qgjv",
  "modified": "2026-05-20T15:35:28Z",
  "published": "2026-05-20T00:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45585"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Nightmare-Eclipse/YellowKey"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-45585 Windows BitLocker Security Feature Bypass Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585"
      },
      {
        "category": "self",
        "summary": "CVE-2026-45585 Windows BitLocker Security Feature Bypass Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-45585.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Windows BitLocker Security Feature Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2026-05-21T07:00:00.000Z",
      "generator": {
        "date": "2026-05-21T07:29:50.981Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-45585",
      "initial_release_date": "2026-05-12T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-19T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-05-20T07:00:00.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Updated **Step 2** of the first mitigation. This is an informational change only."
        },
        {
          "date": "2026-05-21T07:00:00.000Z",
          "legacy_version": "1.2",
          "number": "3",
          "summary": "Added a script to implement a mitigation and removed the manual mitigations. Please read the information to decide if you need to run the provided script."
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-45585",
      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "A successful attacker could bypass the BitLocker Device Encryption feature on the system storage device. An attacker with physical access to the target could exploit this vulnerability to gain access to encrypted data.",
          "title": "What kind of security feature could be bypassed by successfully exploiting this vulnerability?"
        },
        {
          "category": "faq",
          "text": "Yes. This script is an interim security fix that helps to reduce the risk of exploitation of the vulnerability.\nThe script is for WinRE and removes autofstx.exe from the BootExecute registry value. Since BootExecute runs programs very early in boot (even in recovery mode), removing this entry prevents that executable from running in a high\u2011privilege environment, reducing risk.\nIt works by mounting the WinRE image, editing its offline SYSTEM registry to remove the entry if present, then safely committing changes and re\u2011sealing WinRE so BitLocker trust remains intact.\nIt\u2019s designed to be safe\u2014if the autofstx.exe entry isn\u2019t there, it exits without making changes.",
          "title": "Is there a script that I can copy and paste to implement a mitigation?"
        }
      ],
      "product_status": {
        "fixed": [
          "12390",
          "12436",
          "12437",
          "20438",
          "20853"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-45585 Windows BitLocker Security Feature Bypass Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585"
        },
        {
          "category": "self",
          "summary": "CVE-2026-45585 Windows BitLocker Security Feature Bypass Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-45585.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "PHYSICAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "PROOF_OF_CONCEPT",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "WORKAROUND",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 6.3,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Security Feature Bypass"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:Yes;Exploited:No;Latest Software Release:Exploitation More Likely"
        }
      ],
      "title": "Windows BitLocker Security Feature Bypass Vulnerability"
    }
  ]
}

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "Microsoft heeft maatregelen gepubliceerd voor een kwetsbaarheid in Windows besturingssystemen waarmee lokale kwaadwillenden toegang kunnen krijgen tot data die via BitLocker is versleuteld.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheid betreft een security feature bypass in Windows, bekend als \u0027YellowKey\u0027. Er is een proof of concept beschikbaar die aantoont hoe de kwetsbaarheid kan worden misbruikt. De kwetsbaarheid zit niet in de encryptie zelf, maar in de herstelomgeving die BitLocker omringt.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "Microsoft is bezig met het uitbrengen van een security update om de kwetsbaarheid volledig te verhelpen. Tot die tijd zijn er mitigerende maatregelen beschikbaar die als tijdelijke maatregel kunnen worden toegepast. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "medium",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
        "title": "CWE-77"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585"
      }
    ],
    "title": "Kwetsbaarheid aangetroffen in Microsoft Windows",
    "tracking": {
      "current_release_date": "2026-05-20T06:21:50.564164Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2026-0165",
      "initial_release_date": "2026-05-20T06:21:50.564164Z",
      "revision_history": [
        {
          "date": "2026-05-20T06:21:50.564164Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "Windows 11 Version 24H2"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-2"
                }
              }
            ],
            "category": "product_name",
            "name": "Windows 11 Version 24H2 for x64-based Systems"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-3"
                }
              }
            ],
            "category": "product_name",
            "name": "Windows 11 Version 25H2"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-4"
                }
              }
            ],
            "category": "product_name",
            "name": "Windows 11 Version 25H2 for x64-based Systems"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-5"
                }
              }
            ],
            "category": "product_name",
            "name": "Windows 11 version 26H1"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-6"
                }
              }
            ],
            "category": "product_name",
            "name": "Windows 11 version 26H1 for x64-based Systems"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-7"
                }
              }
            ],
            "category": "product_name",
            "name": "Windows Server 2025"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-8"
                }
              }
            ],
            "category": "product_name",
            "name": "Windows Server 2025 (Server Core installation)"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-45585",
      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
          "title": "CWE-77"
        },
        {
          "category": "description",
          "text": "Microsoft has acknowledged a Windows security feature bypass vulnerability named \u0027YellowKey\u0027 with a public proof of concept and issued a CVE to provide mitigation guidance pending a security update.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-45585 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-45585.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8"
          ]
        }
      ],
      "title": "CVE-2026-45585"
    }
  ]
}