certfr_avis - certfr-2026-avi-0622

CERTFR-2026-AVI-0622

Vulnerability from certfr_avis

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

Title

Publication Time

Tags

Bulletin de sécurité Microsoft Windows CVE-2026-45585	2026-05-19	vendor-advisory
Bulletin de sécurité Microsoft Windows CVE-2026-42834	2026-05-19	vendor-advisory

Show details on source website

JSON

To clipboard

{
  "$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"
    }
  ]
}

CVE-2026-42834 (GCVE-0-2026-42834)

Vulnerability from cvelistv5

Published

2026-05-20 13:09

Modified

2026-06-09 19:33

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Summary

Improper access control in Windows Admin Center allows an authorized attacker to elevate privileges over a network.

References

URL

Tags

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42834

vendor-advisory, patch

Impacted products

	Vendor	Product	Version
	Microsoft	Windows Admin Center in Azure Portal	Version: 1.0 < 0.72.0.0.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42834",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-20T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-21T03:55:26.799Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Windows Admin Center in Azure Portal",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "0.72.0.0.",
              "status": "affected",
              "version": "1.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:azure_portal_windows_admin_center:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "0.72.0.0.",
                  "versionStartIncluding": "1.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-05-19T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Improper access control in Windows Admin Center allows an authorized attacker to elevate privileges over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T19:33:49.426Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42834"
        }
      ],
      "title": "Windows Admin Center in Azure Portal Elevation of Privilege Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-42834",
    "datePublished": "2026-05-20T13:09:44.888Z",
    "dateReserved": "2026-04-30T14:51:12.703Z",
    "dateUpdated": "2026-06-09T19:33:49.426Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-45585 (GCVE-0-2026-45585)

Vulnerability from cvelistv5

Published

2026-05-19 23:30

Modified

2026-06-09 19:33

Severity ?

6.8 (Medium) - 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

CWE

CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')

Summary

Microsoft is aware of a security feature bypass vulnerability in Windows publicly referred to as "YellowKey". The proof of concept for this vulnerability has been made public violating coordinated vulnerability best practices. We are issuing this CVE to provide mitigation guidance that can be implemented to protect against this vulnerability until the security update is made available. Mitigation FAQs Should I leverage the temporary mitigation? Microsoft recommends that you consider implementing these mitigations if you are concerned your devices and data are at risk of being compromised or stolen. For example, if your organization’s employees take their work devices home or on business travel. What impact to service availability/management could be caused by implementing the mitigations? Implementing these mitigations will not impact service availability or management operations. Do customers need to revert the changes made to mitigate the vulnerability once the security update to protect against this vulnerability is available? No. The security update will maintain the mitigation's behavior once the security update is installed. I am using TPM+PIN, am I at risk of this vulnerability being exploited No, if you are using TPM+PIN the vulnerability is not exploitable.

References

URL

Tags

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585

vendor-advisory, patch

Impacted products

Vendor

Product

Version

Microsoft

Windows 11 Version 24H2

Version: 10.0.26100.0 < 10.0.26100.8655

Microsoft	Windows 11 Version 25H2	Version: 10.0.26200.0 < 10.0.26200.8655
Microsoft	Windows 11 version 26H1	Version: 10.0.28000.0 < 10.0.28000.2269
Microsoft	Windows Server 2025	Version: 10.0.26100.0 < 10.0.26100.32995
Microsoft	Windows Server 2025 (Server Core installation)	Version: 10.0.26100.0 < 10.0.26100.32995

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45585",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-20T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-21T03:55:18.708Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/Nightmare-Eclipse/YellowKey"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows 11 Version 24H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.8655",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows 11 Version 25H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26200.8655",
              "status": "affected",
              "version": "10.0.26200.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows 11 version 26H1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.28000.2269",
              "status": "affected",
              "version": "10.0.28000.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2025",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.32995",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2025 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.32995",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.26100.32995",
                  "versionStartIncluding": "10.0.26100.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "10.0.26200.8655",
                  "versionStartIncluding": "10.0.26200.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "10.0.26100.8655",
                  "versionStartIncluding": "10.0.26100.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.26100.32995",
                  "versionStartIncluding": "10.0.26100.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "10.0.28000.2269",
                  "versionStartIncluding": "10.0.28000.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-05-19T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "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.\nMitigation FAQs\nShould I leverage the temporary mitigation?\nMicrosoft recommends that you consider implementing these mitigations if you are concerned your devices and data are at risk of being compromised or stolen. For example, if your organization\u2019s employees take their work devices home or on business travel.\nWhat impact to service availability/management could be caused by implementing the mitigations?\nImplementing these mitigations will not impact service availability or management operations.\nDo customers need to revert the changes made to mitigate the vulnerability once the security update to protect against this vulnerability is available?\nNo. The security update will maintain the mitigation\u0027s behavior once the security update is installed.\nI am using TPM+PIN, am I at risk of this vulnerability being exploited\nNo, if you are using TPM+PIN the vulnerability is not exploitable."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-77",
              "description": "CWE-77: Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T19:33:59.604Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Windows BitLocker Security Feature Bypass Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45585"
        }
      ],
      "title": "Windows BitLocker Security Feature Bypass Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-45585",
    "datePublished": "2026-05-19T23:30:26.247Z",
    "dateReserved": "2026-05-12T19:55:45.729Z",
    "dateUpdated": "2026-06-09T19:33:59.604Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Tags

Taxonomy of the tags.

All sightings related to this event Export sightings related to this event

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

CERTFR-2026-AVI-0622

Vulnerability from certfr_avis

Solutions

CVE-2026-42834 (GCVE-0-2026-42834)

Vulnerability from cvelistv5

CVE-2026-45585 (GCVE-0-2026-45585)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature