What is CVE-2026-55001?

CVE-2026-55001 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Active Directory Domain Services Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-55001 cover?

CVE-2026-55001 covers the following CVE IDs: CVE-2026-55001. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-55001?

CVE-2026-55001 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-55001?

CVE-2026-55001 affects 11 products, including: Windows 10 Version 1607 for 32-bit Systems; Windows 10 Version 1607 for x64-based Systems; Windows 10 Version 1809 for 32-bit Systems; Windows 10 Version 1809 for x64-based Systems; Windows Server 2016; and others — see the full list on the advisory page.

CVE-2026-55001HighCVSS 7.8

Active Directory Domain Services Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

July 17, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-55001 →

📋 Description

Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.

🎯 Affected products11

Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Remediation

KB5099538 (Security Update) — fixed build 10.0.17763.9020 KB5099540 (Security Update) — fixed build 10.0.20348.5386 KB5099536 (Security Update) — fixed build 10.0.26100.33158 KB5099535 (Security Update) — fixed build 10.0.14393.9339

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products11

✅ Remediation

🔗 References (9)