MSRC-CVE-2026-88235 — Servicing Stack Updates Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation More Likely. Customer action: Required.

Details

What privileges could an attacker gain by exploiting this vulnerability?
Successful exploitation could allow a local attacker to create files in protected system locations with TrustedInstaller authority.

Security updates
10.0.14393.9681 — https://support.microsoft.com/help/5131083
10.0.17763.9487 — https://support.microsoft.com/help/5131085
10.0.19044.7846 — https://support.microsoft.com/help/5131096
10.0.20348.5870 — https://support.microsoft.com/help/5131090
10.0.22631.7711 — https://support.microsoft.com/help/5131087

Vulnerabilities 1

High 7.8

CVE-2026-88235 Public exploit

Servicing Stack Updates Elevation of Privilege Vulnerability

Unintended proxy or intermediary ('confused deputy') in Servicing Stack Updates allows an authorized attacker to elevate privileges locally.

Microsoft Windows Server 2019 Windows Server 2019 (Server Core installation) Windows 10 Version 1809 Windows

Nov 10, 2026

Revision history

2026-11-10 #1
Information published.

References

CVE-2026-88235 Servicing Stack Updates Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88235
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss