CVE-2026-87700: CWE-416: Use After Free in Microsoft Windows 10 Version 1607
Description
CVE-2026-87700 is a use-after-free vulnerability in Windows Installer on Microsoft Windows 10 Version 1607 and other specified versions. This flaw allows an authorized local attacker to elevate privileges. The vulnerability has a high severity rating with a CVSS score of 7.8. An official fix is available from Microsoft.
CVSS v3.1
Score 7.8high
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
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 11 Version 26H2
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
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-2026-87700) involves a use-after-free condition in the Windows Installer component of Microsoft Windows 10 Version 1607 and other specified versions. Exploitation requires local access with authorized privileges and can lead to privilege escalation. The CVSS 3.1 vector indicates low attack complexity and privileges required, no user interaction, and impacts confidentiality, integrity, and availability with high severity. Microsoft has published an official fix addressing this issue.
Potential Impact
An authorized local attacker can exploit this use-after-free vulnerability to elevate their privileges on affected Windows 10 systems. This could allow the attacker to execute code with higher privileges, potentially compromising system confidentiality, integrity, and availability.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users and administrators should apply the security updates provided by Microsoft to affected Windows 10 versions to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-08T23:57:53.797Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87700","vendor":"Microsoft"}]
Threat ID: 6ace85512cdf04f6569ff31c
Added to database: 10/13/2026, 19:24:01 UTC
Last enriched: 10/14/2026, 02:19:54 UTC
Last updated: 10/14/2026, 02:19:54 UTC
Views: 3
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