CVE-2026-42976: CWE-306: Missing Authentication for Critical Function in Microsoft Windows 10 Version 1607
Missing authentication for critical function in Windows RPC API allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-42976) is classified under CWE-306 (Missing Authentication for Critical Function). It affects Windows 10 Version 1607 (build 10.0.14393.0) and involves a missing authentication check in the Windows RPC API, which could be exploited by an authorized local attacker to elevate their privileges. The CVSS v3.1 base score is 7.8, indicating high severity, with impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this vulnerability, as detailed in their security advisory.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges on the affected Windows 10 Version 1607 system. This could lead to full system compromise, affecting confidentiality, integrity, and availability of the system.
Mitigation Recommendations
Apply the official security update provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42976. This patch addresses the missing authentication issue in the Windows RPC API. No additional mitigations are specified by the vendor.
CVE-2026-42976: CWE-306: Missing Authentication for Critical Function in Microsoft Windows 10 Version 1607
Description
Missing authentication for critical function in Windows RPC API allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-42976) is classified under CWE-306 (Missing Authentication for Critical Function). It affects Windows 10 Version 1607 (build 10.0.14393.0) and involves a missing authentication check in the Windows RPC API, which could be exploited by an authorized local attacker to elevate their privileges. The CVSS v3.1 base score is 7.8, indicating high severity, with impact on confidentiality, integrity, and availability. Microsoft has published an official fix for this vulnerability, as detailed in their security advisory.
Potential Impact
An authorized local attacker can exploit this vulnerability to elevate privileges on the affected Windows 10 Version 1607 system. This could lead to full system compromise, affecting confidentiality, integrity, and availability of the system.
Mitigation Recommendations
Apply the official security update provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42976. This patch addresses the missing authentication issue in the Windows RPC API. No additional mitigations are specified by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-30T23:43:50.745Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42976","vendor":"Microsoft"}]
Threat ID: 6a7b57f3bf8831d5391555c5
Added to database: 08/11/2026, 17:12:19 UTC
Last enriched: 08/11/2026, 23:28:59 UTC
Last updated: 08/12/2026, 00:12:09 UTC
Views: 4
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