CVE-2026-20821: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in Microsoft Windows 10 Version 1607
Exposure of sensitive information to an unauthorized actor in Windows Remote Procedure Call allows an unauthorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20821) involves an exposure of sensitive information to an unauthorized actor through Windows Remote Procedure Call in Windows 10 Version 1607 (build 10.0.14393.0). The attacker can disclose information locally without privileges or user interaction. The CVSS v3.1 base score is 6.2, indicating a medium severity. Microsoft has released an official fix to remediate this vulnerability as documented in their security update guide.
Potential Impact
An unauthorized local attacker can disclose sensitive information due to this vulnerability. There is no impact on integrity or availability, only confidentiality is affected. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Apply the official security update provided by Microsoft as referenced in their advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20821). This update fully addresses the vulnerability.
CVE-2026-20821: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor in Microsoft Windows 10 Version 1607
Description
Exposure of sensitive information to an unauthorized actor in Windows Remote Procedure Call allows an unauthorized attacker to disclose information locally.
CVSS v3.1
Score 6.2medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20821) involves an exposure of sensitive information to an unauthorized actor through Windows Remote Procedure Call in Windows 10 Version 1607 (build 10.0.14393.0). The attacker can disclose information locally without privileges or user interaction. The CVSS v3.1 base score is 6.2, indicating a medium severity. Microsoft has released an official fix to remediate this vulnerability as documented in their security update guide.
Potential Impact
An unauthorized local attacker can disclose sensitive information due to this vulnerability. There is no impact on integrity or availability, only confidentiality is affected. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Apply the official security update provided by Microsoft as referenced in their advisory (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20821). This update fully addresses the vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.374Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20821","vendor":"Microsoft"}]
Threat ID: 69668adba60475309f9adf9d
Added to database: 01/13/2026, 18:11:39 UTC
Last enriched: 07/30/2026, 23:49:05 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 185
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