CVE-2026-49783: CWE-358: Improperly Implemented Security Check for Standard in Microsoft Windows 10 Version 1607
CVE-2026-49783 is a high-severity vulnerability in Microsoft Windows 10 Version 1607 (build 10.0.14393.0) involving an improperly implemented security check in Windows Secure Boot. This flaw allows an authorized local attacker to bypass a security feature. An official fix is available from Microsoft to address this issue.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-49783) stems from an improperly implemented security check related to Windows Secure Boot in Windows 10 Version 1607 (build 10.0.14393.0). It enables a local attacker with some level of authorization to bypass security protections that Secure Boot is intended to enforce. The CVSS v3.1 base score is 7.8, indicating high severity, with impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability as documented in their security update guide.
Potential Impact
An authorized local attacker can bypass Windows Secure Boot protections, potentially leading to full compromise of system confidentiality, integrity, and availability. This could allow execution of unauthorized code or persistence mechanisms that undermine system security.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1607 (build 10.0.14393.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49783.
CVE-2026-49783: CWE-358: Improperly Implemented Security Check for Standard in Microsoft Windows 10 Version 1607
Description
CVE-2026-49783 is a high-severity vulnerability in Microsoft Windows 10 Version 1607 (build 10.0.14393.0) involving an improperly implemented security check in Windows Secure Boot. This flaw allows an authorized local attacker to bypass a security feature. An official fix is available from Microsoft to address this issue.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-49783) stems from an improperly implemented security check related to Windows Secure Boot in Windows 10 Version 1607 (build 10.0.14393.0). It enables a local attacker with some level of authorization to bypass security protections that Secure Boot is intended to enforce. The CVSS v3.1 base score is 7.8, indicating high severity, with impact on confidentiality, integrity, and availability. Microsoft has released an official fix for this vulnerability as documented in their security update guide.
Potential Impact
An authorized local attacker can bypass Windows Secure Boot protections, potentially leading to full compromise of system confidentiality, integrity, and availability. This could allow execution of unauthorized code or persistence mechanisms that undermine system security.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 1607 (build 10.0.14393.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49783.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-01T17:02:37.207Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49783","vendor":"Microsoft"}]
Threat ID: 6a566f6d68715ace43e6b51e
Added to database: 07/14/2026, 17:18:37 UTC
Last enriched: 07/15/2026, 01:48:13 UTC
Last updated: 07/15/2026, 01:48:13 UTC
Views: 2
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