CVE-2026-88235

Servicing Stack Updates Elevation of Privilege Vulnerability

CVE-2026-88235 is fixed in 18 products on 1 platform, first by KB5131087, released November 10, 2026. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent

CVSS

7.8

Important

Exploitation

More likely

Vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

n/a

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 10 Version 1607 for 32-bit Systems		KB5131083	Nov 10, 2026
Windows 10 Version 1607 for x64-based Systems		KB5131083	Nov 10, 2026
Windows 10 Version 1809 for 32-bit Systems		KB5131085	Nov 10, 2026
Windows 10 Version 1809 for x64-based Systems		KB5131085	Nov 10, 2026
Windows 10 Version 21H2 for 32-bit Systems		KB5131096	Nov 10, 2026
Windows 10 Version 21H2 for ARM64-based Systems		KB5131096	Nov 10, 2026
Windows 10 Version 21H2 for x64-based Systems		KB5131096	Nov 10, 2026
Windows 10 Version 22H2 for 32-bit Systems		KB5131096	Nov 10, 2026
Windows 10 Version 22H2 for ARM64-based Systems		KB5131096	Nov 10, 2026
Windows 10 Version 22H2 for x64-based Systems		KB5131096	Nov 10, 2026
Windows 11 Version 23H2 for ARM64-based Systems	22631.7711	KB5131087	Nov 10, 2026
Windows 11 Version 23H2 for x64-based Systems	22631.7711	KB5131087	Nov 10, 2026
Windows Server 2016		KB5131083	Nov 10, 2026
Windows Server 2016 (Server Core installation)		KB5131083	Nov 10, 2026
Windows Server 2019		KB5131085	Nov 10, 2026
Windows Server 2019 (Server Core installation)		KB5131085	Nov 10, 2026
Windows Server 2022	20348.5870	KB5131090	Nov 10, 2026
Windows Server 2022 (Server Core installation)	20348.5870	KB5131090	Nov 10, 2026

Details

Published
November 10, 2026
Weakness
Unintended Proxy or Intermediary ('Confused Deputy')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88235

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