CVE-2026-50303: CWE-1240: Use of a Cryptographic Primitive with a Risky Implementation in Microsoft Windows 10 Version 1809
CVE-2026-50303 is a medium severity vulnerability in Microsoft Windows 10 Version 1809 involving the use of a cryptographic primitive with a risky implementation in Windows Key Guard. This flaw allows an authorized local attacker to bypass a security feature. The vulnerability has an official fix available from Microsoft.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-50303) arises from the use of a cryptographic primitive with a risky implementation within Windows Key Guard on Windows 10 Version 1809 (build 10.0.17763.0). An authorized attacker with local access can exploit this flaw to bypass a security feature. The CVSS v3.1 base score is 5.5 (medium severity), reflecting local attack vector with low complexity and no user interaction required. Microsoft has published an official fix to address this issue.
Potential Impact
An authorized local attacker can bypass a security feature due to the risky cryptographic implementation. The confidentiality impact is high, while integrity and availability impacts are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50303 to remediate this vulnerability.
CVE-2026-50303: CWE-1240: Use of a Cryptographic Primitive with a Risky Implementation in Microsoft Windows 10 Version 1809
Description
CVE-2026-50303 is a medium severity vulnerability in Microsoft Windows 10 Version 1809 involving the use of a cryptographic primitive with a risky implementation in Windows Key Guard. This flaw allows an authorized local attacker to bypass a security feature. The vulnerability has an official fix available from Microsoft.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-50303) arises from the use of a cryptographic primitive with a risky implementation within Windows Key Guard on Windows 10 Version 1809 (build 10.0.17763.0). An authorized attacker with local access can exploit this flaw to bypass a security feature. The CVSS v3.1 base score is 5.5 (medium severity), reflecting local attack vector with low complexity and no user interaction required. Microsoft has published an official fix to address this issue.
Potential Impact
An authorized local attacker can bypass a security feature due to the risky cryptographic implementation. The confidentiality impact is high, while integrity and availability impacts are not affected. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50303 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-04T17:30:16.975Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50303","vendor":"Microsoft"}]
Threat ID: 6a566f7368715ace43e6b757
Added to database: 07/14/2026, 17:18:43 UTC
Last enriched: 07/15/2026, 01:33:22 UTC
Last updated: 07/15/2026, 01:33:22 UTC
Views: 3
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