Active Directory Federation Services (AD FS)
CVE-2026-56155 — Active Directory Federation Services Elevation of Privilege Vulnerability
Executive Summary
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
Overview
7.8
CVSS HIGH
Important
MS Severity
Exploited
MS Exploit Status
Exploitation Detected
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Functional
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.2
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
15 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1607 for 32-bit Systems | 5099535 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5099535 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5099538 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5099538 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 | 5099445 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 (Server Core installation) | 5099445 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 R2 | 5099444 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 R2 (Server Core installation) | 5099444 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 | 5099535 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 5099535 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 5099538 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 5099538 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022 | 5099540 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2025 | 5099536 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2025 (Server Core installation) | 5099536 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
6 patches
| Article | Type | Restart |
|---|---|---|
5099535 |
Security Update | Yes |
5099538 |
Security Update | Yes |
5099445 |
Monthly Rollup | Yes |
5099444 |
Monthly Rollup | Yes |
5099540 |
Security Update | Yes |
5099536 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
References
On This Page