← CVE Radar
CVE-2026-56155Active Directory Federation Services Elevation of Privilege Vulnerability
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
7.8 HIGHEPSS 0.34%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.8 | HIGH | 3.1microsoft (CNA) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 7.8 | HIGH | 3.1microsoft (CNA) | 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 |
CISA required action
⚡ Known exploited · remediation due Jul 28, 2026
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.
Details
- CVE ID
- CVE-2026-56155
- Status
- Analyzed
- Assigner (CNA)
- microsoft
- Published
- Jul 14, 2026
- Last modified
- 2026-11-01 17:32 UTC
- Weaknesses
- CWE-1220 · Insufficient Granularity of Access Control
Affected Products
As published by the CNA in the CVE record.
MicrosoftWindows 10 Version 16071 version range
- 10.0.14393.0 before 10.0.14393.9339
MicrosoftWindows 10 Version 18091 version range
- 10.0.17763.0 before 10.0.17763.9020
MicrosoftWindows Server 20121 version range
- 6.2.9200.0 before 6.2.9200.26226
MicrosoftWindows Server 2012 (Server Core installation)1 version range
- 6.2.9200.0 before 6.2.9200.26226
MicrosoftWindows Server 2012 R21 version range
- 6.3.9600.0 before 6.3.9600.23291
MicrosoftWindows Server 2012 R2 (Server Core installation)1 version range
- 6.3.9600.0 before 6.3.9600.23291
MicrosoftWindows Server 20161 version range
- 10.0.14393.0 before 10.0.14393.9339
MicrosoftWindows Server 2016 (Server Core installation)1 version range
- 10.0.14393.0 before 10.0.14393.9339
MicrosoftWindows Server 20191 version range
- 10.0.17763.0 before 10.0.17763.9020
MicrosoftWindows Server 2019 (Server Core installation)1 version range
- 10.0.17763.0 before 10.0.17763.9020
MicrosoftWindows Server 20221 version range
- 10.0.20348.0 before 10.0.20348.5386
MicrosoftWindows Server 20251 version range
- 10.0.26100.0 before 10.0.26100.33158
MicrosoftWindows Server 2025 (Server Core installation)1 version range
- 10.0.26100.0 before 10.0.26100.33158