High MSRC-CVE-2026-55144 1 CVE

Windows Cryptography API: Next Generation (CNG) Tampering Vulnerability

Published Jul 14, 2026 · Updated Jul 14, 2026

Vendor: Microsoft

Summary

Impact: Tampering. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.

Details

Security updates
10.0.20348.5386 — https://support.microsoft.com/help/5099540
10.0.26100.33158 — https://support.microsoft.com/help/5099536
10.0.26200.8875 — https://support.microsoft.com/help/5101650
10.0.28000.2525 — https://support.microsoft.com/help/5101649

Vulnerabilities 1

High 7.1

CVE-2026-55144

Windows Cryptography API: Next Generation (CNG) Tampering Vulnerability

Missing cryptographic step in Windows CryptoAPI allows an authorized attacker to perform tampering locally.

Microsoft Windows Server 2022 Windows Server 2025 Windows Server 2025 (Server Core installation) Windows

Jul 14, 2026

Revision history

2026-07-14 #1
Information published.

References

CVE-2026-55144 Windows Cryptography API: Next Generation (CNG) Tampering Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55144
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss