CVE-2026-21508: CWE-287: Improper Authentication in Microsoft Windows 10 Version 1607
Improper authentication in Windows Storage allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-21508) affects Windows 10 Version 1607 (build 10.0.14393.0) and is classified under CWE-287 (Improper Authentication). It arises from improper authentication mechanisms in Windows Storage, enabling a local attacker with some level of authorization to escalate privileges. The CVSS 3.1 vector indicates that the attack requires local access with high attack complexity and low privileges but no user interaction. The impact includes high confidentiality, integrity, and availability losses. 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 can lead to full system compromise, affecting confidentiality, integrity, and availability of the system. No known exploits are currently reported in the wild.
Mitigation Recommendations
Microsoft has released an official fix for CVE-2026-21508. It is recommended to apply the security update provided by Microsoft as soon as possible to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-21508: CWE-287: Improper Authentication in Microsoft Windows 10 Version 1607
Description
Improper authentication in Windows Storage allows an authorized attacker to elevate privileges locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-21508) affects Windows 10 Version 1607 (build 10.0.14393.0) and is classified under CWE-287 (Improper Authentication). It arises from improper authentication mechanisms in Windows Storage, enabling a local attacker with some level of authorization to escalate privileges. The CVSS 3.1 vector indicates that the attack requires local access with high attack complexity and low privileges but no user interaction. The impact includes high confidentiality, integrity, and availability losses. 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 can lead to full system compromise, affecting confidentiality, integrity, and availability of the system. No known exploits are currently reported in the wild.
Mitigation Recommendations
Microsoft has released an official fix for CVE-2026-21508. It is recommended to apply the security update provided by Microsoft as soon as possible to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-30T18:10:54.844Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21508","vendor":"Microsoft"}]
Threat ID: 698b76054b57a58fa120a673
Added to database: 2/10/2026, 6:16:37 PM
Last enriched: 5/12/2026, 5:13:57 AM
Last updated: 5/22/2026, 4:55:43 AM
Views: 318
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