CVE-2026-42906: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in Microsoft Windows 10 Version 21H2
Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-42906) involves the exposure of sensitive information to an unauthorized actor through the Windows Shell component in Windows 10 Version 21H2 (build 10.0.19044.0). An attacker with local privileges can disclose sensitive data without user interaction. The CVSS 3.1 base score is 5.5, reflecting medium severity with high confidentiality impact but no integrity or availability impact. The vulnerability has been officially fixed by Microsoft as per their advisory.
Potential Impact
An authorized local attacker can disclose sensitive information, potentially leading to information leakage. There is no impact on integrity or availability. The vulnerability requires local access and low privileges, with no user interaction needed.
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-2026-42906 to remediate this vulnerability.
CVE-2026-42906: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in Microsoft Windows 10 Version 21H2
Description
Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized attacker to disclose information locally.
CVSS v3.1
Score 5.5medium
Affected software
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-42906) involves the exposure of sensitive information to an unauthorized actor through the Windows Shell component in Windows 10 Version 21H2 (build 10.0.19044.0). An attacker with local privileges can disclose sensitive data without user interaction. The CVSS 3.1 base score is 5.5, reflecting medium severity with high confidentiality impact but no integrity or availability impact. The vulnerability has been officially fixed by Microsoft as per their advisory.
Potential Impact
An authorized local attacker can disclose sensitive information, potentially leading to information leakage. There is no impact on integrity or availability. The vulnerability requires local access and low privileges, with no user interaction needed.
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-2026-42906 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-30T22:35:54.968Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42906","vendor":"Microsoft"}]
Threat ID: 6a284cc08dd33fbd856646e5
Added to database: 06/09/2026, 17:26:24 UTC
Last enriched: 08/14/2026, 13:19:01 UTC
Last updated: 09/12/2026, 10:01:31 UTC
Views: 95
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