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CVE-2026-50303

Windows Key Guard Security Feature Bypass Vulnerability

Published: Jul 14, 2026Updated: Jul 16, 2026 Sources: CVE List NVDCWE-1240
5.5MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 89.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Use of a cryptographic primitive with a risky implementation in Windows Key Guard allows an authorized attacker to bypass a security feature locally.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:NA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-1240

Affected Products

Microsoft
commercial·US
Windows 10 Version 1809On-premOS
Operating Systems / windows
Windows 11 Version 24H2On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
and 15 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-50303?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50303
msrc.microsoft.com
News mentions
2

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