CVE-2026-56155 (GCVE-0-2026-56155)
Vulnerability from cvelistv5
Published
2026-07-14 17:05
Modified
2026-08-28 17:50
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
CWE
  • CWE-1220 - Insufficient Granularity of Access Control
Summary
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1607 Version: 10.0.14393.0   < 10.0.14393.9339
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   Microsoft Windows 10 Version 1809 Version: 10.0.17763.0   < 10.0.17763.9020
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   Microsoft Windows Server 2012 Version: 6.2.9200.0   < 6.2.9200.26226
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   Microsoft Windows Server 2012 (Server Core installation) Version: 6.2.9200.0   < 6.2.9200.26226
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   Microsoft Windows Server 2012 R2 Version: 6.3.9600.0   < 6.3.9600.23291
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   Microsoft Windows Server 2012 R2 (Server Core installation) Version: 6.3.9600.0   < 6.3.9600.23291
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   Microsoft Windows Server 2016 Version: 10.0.14393.0   < 10.0.14393.9339
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   Microsoft Windows Server 2016 (Server Core installation) Version: 10.0.14393.0   < 10.0.14393.9339
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   Microsoft Windows Server 2019 Version: 10.0.17763.0   < 10.0.17763.9020
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   Microsoft Windows Server 2019 (Server Core installation) Version: 10.0.17763.0   < 10.0.17763.9020
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   Microsoft Windows Server 2022 Version: 10.0.20348.0   < 10.0.20348.5386
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   Microsoft Windows Server 2025 Version: 10.0.26100.0   < 10.0.26100.33158
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   Microsoft Windows Server 2025 (Server Core installation) Version: 10.0.26100.0   < 10.0.26100.33158
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CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog

Date added: 2026-07-14

Due date: 2026-07-28

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (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's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Used in ransomware: Unknown

Notes: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56155 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-56155; https://learn.microsoft.com/en-us/windows-server/identity/ad-fs/decommission/adfs-decommission-guide

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      "cveMetadata": "{\"cveId\": \"CVE-2026-56155\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-28T17:50:58.752Z\", \"dateReserved\": \"2026-06-19T13:53:31.988Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-07-14T17:05:11.702Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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