CVE-2026-56155: CWE-1220: Insufficient Granularity of Access Control in Microsoft Windows 10 Version 1607
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-56155) affects Windows 10 Version 1607 (build 10.0.14393.0) and involves insufficient granularity of access control in Active Directory Federation Services (AD FS). It enables an attacker who already has some level of authorization and local access to escalate their privileges on the affected system. The CVSS 3.1 vector indicates low attack complexity, low privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges, potentially gaining higher-level access than intended. This can lead to full compromise of the affected system's confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56155 to remediate this vulnerability.
CVE-2026-56155: CWE-1220: Insufficient Granularity of Access Control in Microsoft Windows 10 Version 1607
Description
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-56155) affects Windows 10 Version 1607 (build 10.0.14393.0) and involves insufficient granularity of access control in Active Directory Federation Services (AD FS). It enables an attacker who already has some level of authorization and local access to escalate their privileges on the affected system. The CVSS 3.1 vector indicates low attack complexity, low privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges, potentially gaining higher-level access than intended. This can lead to full compromise of the affected system's confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56155 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-19T13:53:31.988Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56155","vendor":"Microsoft"}]
Threat ID: 6a566f8168715ace43e6bfa8
Added to database: 07/14/2026, 17:18:57 UTC
Last enriched: 07/14/2026, 17:47:41 UTC
Last updated: 07/15/2026, 01:47:58 UTC
Views: 11
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