FKIE_CVE-2026-56155

Vulnerability from fkie_nvd - Published: 2026-07-14 17:17 - Updated: 2026-07-15 14:18
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
References
secure@microsoft.comhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56155Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56155US Government Resource
Impacted products
Vendor Product Version
microsoft windows_10_1607 *
microsoft windows_10_1607 *
microsoft windows_10_1809 *
microsoft windows_10_1809 *
microsoft windows_server_2012 -
microsoft windows_server_2012 r2
microsoft windows_server_2016 *
microsoft windows_server_2019 *
microsoft windows_server_2022 *
microsoft windows_server_2025 *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 1607",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.9339",
              "status": "affected",
              "version": "10.0.14393.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 1809",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.9020",
              "status": "affected",
              "version": "10.0.17763.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.2.9200.26226",
              "status": "affected",
              "version": "6.2.9200.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.2.9200.26226",
              "status": "affected",
              "version": "6.2.9200.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 R2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.3.9600.23291",
              "status": "affected",
              "version": "6.3.9600.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 R2 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.3.9600.23291",
              "status": "affected",
              "version": "6.3.9600.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2016",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.9339",
              "status": "affected",
              "version": "10.0.14393.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2016 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.9339",
              "status": "affected",
              "version": "10.0.14393.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2019",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.9020",
              "status": "affected",
              "version": "10.0.17763.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2019 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.9020",
              "status": "affected",
              "version": "10.0.17763.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2022",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.20348.5386",
              "status": "affected",
              "version": "10.0.20348.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2025",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.33158",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2025 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.33158",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "cisaActionDue": "2026-07-28",
  "cisaExploitAdd": "2026-07-14",
  "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
  "cisaVulnerabilityName": "Microsoft Active Directory Federation Services Insufficient Granularity of Access Control Vulnerability ",
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*",
              "matchCriteriaId": "1A8DB50E-7571-4925-A293-CAB93ECD0EBF",
              "versionEndExcluding": "10.0.14393.9339",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*",
              "matchCriteriaId": "A9DC4EC9-4E72-4CBC-BA0B-39CCC45DB8CE",
              "versionEndExcluding": "10.0.14393.9339",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*",
              "matchCriteriaId": "643F21D8-3A5B-477D-AFFC-2451DDC472CC",
              "versionEndExcluding": "10.0.17763.9020",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*",
              "matchCriteriaId": "A68E51D8-C76C-4C9E-9CBD-C7D4D4BCDFAA",
              "versionEndExcluding": "10.0.17763.9020",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*",
              "matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "34D1270A-7D50-46CC-87EE-0A4E25F9C800",
              "versionEndExcluding": "10.0.14393.9339",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D0E1AB94-0B38-4BB7-94EB-988EA266D6D5",
              "versionEndExcluding": "10.0.17763.9020",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "9E9A0C18-3AD2-4E59-97AF-A2343E466929",
              "versionEndExcluding": "10.0.20348.5386",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "22BE2FE9-37B9-4FF2-B43A-60A3518E0F08",
              "versionEndExcluding": "10.0.26100.33158",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally."
    }
  ],
  "id": "CVE-2026-56155",
  "lastModified": "2026-07-15T14:18:24.010",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-56155",
          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T03:55:53.880960Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-14T17:17:09.763",
  "references": [
    {
      "source": "secure@microsoft.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56155"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "US Government Resource"
      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56155"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1220"
        }
      ],
      "source": "secure@microsoft.com",
      "type": "Secondary"
    }
  ]
}



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