CVE-2026-85366
Windows Installer Elevation of Privilege Vulnerability
CVE-2026-85366 is fixed in 32 products on 1 platform, first by KB5126868, released October 13, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.8
Important
Exploitation
None reported
Exploitation Less Likely
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0031
24th percentile
<p>Heap-based buffer overflow in Windows Installer 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 | 14393.9612 | KB5126868 | Oct 13, 2026 |
| Windows 10 Version 1607 for x64-based Systems | 14393.9612 | KB5126868 | Oct 13, 2026 |
| Windows 10 Version 1809 for 32-bit Systems | 17763.9376 | KB5126651 | Oct 13, 2026 |
| Windows 10 Version 1809 for x64-based Systems | 17763.9376 | KB5126651 | Oct 13, 2026 |
| Windows 10 Version 21H2 for 32-bit Systems | KB5126657 | Oct 13, 2026 | |
| Windows 10 Version 21H2 for ARM64-based Systems | KB5126657 | Oct 13, 2026 | |
| Windows 10 Version 21H2 for x64-based Systems | KB5126657 | Oct 13, 2026 | |
| Windows 10 Version 22H2 for 32-bit Systems | KB5126657 | Oct 13, 2026 | |
| Windows 10 Version 22H2 for ARM64-based Systems | KB5126657 | Oct 13, 2026 | |
| Windows 10 Version 22H2 for x64-based Systems | KB5126657 | Oct 13, 2026 | |
| Windows 11 Version 23H2 for ARM64-based Systems | 22631.7652 | KB5126653 | Oct 13, 2026 |
| Windows 11 Version 23H2 for x64-based Systems | 22631.7652 | KB5126653 | Oct 13, 2026 |
| Windows 11 Version 24H2 for ARM64-based Systems | KB5127648 | Oct 13, 2026 | |
| Windows 11 Version 24H2 for x64-based Systems | KB5127648 | Oct 13, 2026 | |
| Windows 11 Version 25H2 for ARM64-based Systems | KB5127648 | Oct 13, 2026 | |
| Windows 11 Version 25H2 for x64-based Systems | KB5127648 | Oct 13, 2026 | |
| Windows 11 Version 26H1 for ARM64-based Systems | 28000.3231 | KB5127646 | Oct 13, 2026 |
| Windows 11 Version 26H2 for ARM64-based Systems | KB5127648 | Oct 13, 2026 | |
| Windows 11 Version 26H2 for x64-based Systems | KB5127648 | Oct 13, 2026 | |
| Windows 11 version 26H1 for x64-based Systems | 28000.3231 | KB5127646 | Oct 13, 2026 |
| Windows Server 2012 | KB5126835 | Oct 13, 2026 | |
| Windows Server 2012 (Server Core installation) | KB5126835 | Oct 13, 2026 | |
| Windows Server 2012 R2 | KB5126836 | Oct 13, 2026 | |
| Windows Server 2012 R2 (Server Core installation) | KB5126836 | Oct 13, 2026 | |
| Windows Server 2016 | 14393.9612 | KB5126868 | Oct 13, 2026 |
| Windows Server 2016 (Server Core installation) | 14393.9612 | KB5126868 | Oct 13, 2026 |
| Windows Server 2019 | 17763.9376 | KB5126651 | Oct 13, 2026 |
| Windows Server 2019 (Server Core installation) | 17763.9376 | KB5126651 | Oct 13, 2026 |
| Windows Server 2022 | 20348.5761 | KB5126655 | Oct 13, 2026 |
| Windows Server 2022 (Server Core installation) | 20348.5761 | KB5126655 | Oct 13, 2026 |
| Windows Server 2025 | 26100.33650 | KB5126646 | Oct 13, 2026 |
| Windows Server 2025 (Server Core installation) | 26100.33650 | KB5126646 | Oct 13, 2026 |
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