CVE-2026-503035.5MediumCWE-1240

CVE-2026-50303: Windows Key Guard Security Feature Bypass Vulnerability

Microsoft · Windows 10 Version 1809

Vendor fix available · Affected: Microsoft Windows 10 Version 1809 · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.3%probability of exploitation in the next 30 days

19th percentile

050100

Higher than 19% of scored CVEs

5.5MediumCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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

Affected products11

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Microsoft · Windows 10 Version 1809from 10.0.17763.0 before 10.0.17763.9020
Microsoft · Windows 10 Version 21H2from 10.0.19044.0 before 10.0.19044.7548
Microsoft · Windows 10 Version 22H2from 10.0.19045.0 before 10.0.19045.7548
Microsoft · Windows 11 Version 24H2from 10.0.26100.0 before 10.0.26100.8875
Microsoft · Windows 11 Version 25H2from 10.0.26200.0 before 10.0.26200.8875
Microsoft · Windows 11 version 26H1from 10.0.28000.0 before 10.0.28000.2525
Microsoft · Windows Server 2019from 10.0.17763.0 before 10.0.17763.9020
Microsoft · Windows Server 2019 (Server Core installation)from 10.0.17763.0 before 10.0.17763.9020
Microsoft · Windows Server 2022from 10.0.20348.0 before 10.0.20348.5386
Microsoft · Windows Server 2025from 10.0.26100.0 before 10.0.26100.33158
Microsoft · Windows Server 2025 (Server Core installation)from 10.0.26100.0 before 10.0.26100.33158

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

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Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Use of a Cryptographic Primitive with a Risky Implementation · Cryptography
Vendor: Microsoft
Published: July 2026
Band: Unlikely (under 1%), July 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-50303 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.