HarborGuard / CVE
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HIGHCVE-2026-26176Published Modified CNA microsoft

CVE-2026-26176: Windows Client Side Caching driver (csc.sys) Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Client Side Caching driver (csc.sys) allows an authorized attacker to elevate privileges locally.

Metrics

CVSS v3.1
7.8
Severity
HIGH
Fixed in
6.2.9200.26026
Affected Products
21

Fix available

6.2.9200.260266.3.9600.2313210.0.14393.906010.0.17763.864410.0.19044.718410.0.19045.718410.0.20348.502010.0.22631.693610.0.25398.227410.0.26100.824610.0.26100.3269010.0.26200.824610.0.28000.1836
Patch commits
Affected packages
  • Microsoft / Windows 10 Version 1607
    < 10.0.14393.9060 (from 10.0.14393.0)
  • Microsoft / Windows 10 Version 1809
    < 10.0.17763.8644 (from 10.0.17763.0)
  • Microsoft / Windows 10 Version 21H2
    < 10.0.19044.7184 (from 10.0.19044.0)
  • Microsoft / Windows 10 Version 22H2
    < 10.0.19045.7184 (from 10.0.19045.0)
  • Microsoft / Windows 11 version 22H3
    < 10.0.22631.6936 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 23H2
    < 10.0.22631.6936 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 24H2
    < 10.0.26100.8246 (from 10.0.26100.0)
  • Microsoft / Windows 11 Version 25H2
    < 10.0.26200.8246 (from 10.0.26200.0)
  • Microsoft / Windows 11 version 26H1
    < 10.0.28000.1836 (from 10.0.28000.0)
  • Microsoft / Windows Server 2012
    < 6.2.9200.26026 (from 6.2.9200.0)
  • Microsoft / Windows Server 2012 (Server Core installation)
    < 6.2.9200.26026 (from 6.2.9200.0)
  • Microsoft / Windows Server 2012 R2
    < 6.3.9600.23132 (from 6.3.9600.0)
  • Microsoft / Windows Server 2012 R2 (Server Core installation)
    < 6.3.9600.23132 (from 6.3.9600.0)
  • Microsoft / Windows Server 2016
    < 10.0.14393.9060 (from 10.0.14393.0)
  • Microsoft / Windows Server 2016 (Server Core installation)
    < 10.0.14393.9060 (from 10.0.14393.0)
  • Microsoft / Windows Server 2019
    < 10.0.17763.8644 (from 10.0.17763.0)
  • Microsoft / Windows Server 2019 (Server Core installation)
    < 10.0.17763.8644 (from 10.0.17763.0)
  • Microsoft / Windows Server 2022
    < 10.0.20348.5020 (from 10.0.20348.0)
  • Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)
    < 10.0.25398.2274 (from 10.0.25398.0)
  • Microsoft / Windows Server 2025
    < 10.0.26100.32690 (from 10.0.26100.0)
  • Microsoft / Windows Server 2025 (Server Core installation)
    < 10.0.26100.32690 (from 10.0.26100.0)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References