OnlyPatch
Windows CryptoAPI

CVE-2026-55144 — Windows Cryptography API: Next Generation (CNG) Tampering Vulnerability

Important CVSS 7.1 2026-07 archive

Executive Summary

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

Overview

7.1
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Exploitation Unlikely
MS Exploit Likelihood
Category Tampering
Released Jul 14 2026
Last Updated Jul 14 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known

CVSS Vector

ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.2

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

9 affected products
Product KB Article Severity Impact Restart Required
Windows 11 Version 24H2 for ARM64-based Systems 5101650 (Security Update) Important Tampering Yes
Windows 11 Version 24H2 for x64-based Systems 5101650 (Security Update) Important Tampering Yes
Windows 11 Version 25H2 for ARM64-based Systems 5101650 (Security Update) Important Tampering Yes
Windows 11 Version 25H2 for x64-based Systems 5101650 (Security Update) Important Tampering Yes
Windows 11 Version 26H1 for ARM64-based Systems 5101649 (Security Update) Important Tampering Yes
Windows 11 version 26H1 for x64-based Systems 5101649 (Security Update) Important Tampering Yes
Windows Server 2022 5099540 (Security Update) Important Tampering Yes
Windows Server 2025 5099536 (Security Update) Important Tampering Yes
Windows Server 2025 (Server Core installation) 5099536 (Security Update) Important Tampering Yes

Patches

4 patches
Article Type Restart
5101650 Security Update Yes
5101649 Security Update Yes
5099540 Security Update Yes
5099536 Security Update Yes

Known Exploits

Acknowledgments

Samuel Lee with Microsoft

On This Page