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.
Other sources
Windows Client Side Caching driver (csc.sys) Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5020Patch KB5082142 - Upgrade
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Fixed in 10.0.14393.9060Patch KB5082198 - Upgrade
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Fixed in 10.0.26100.8246Patch KB5083769 - Upgrade
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Fixed in 10.0.26100.32690Patch KB5082063 - Upgrade
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Fixed in 10.0.25398.2274Patch KB5082060 - Upgrade
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Fixed in 10.0.26200.8246Patch KB5083769 - Upgrade
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Fixed in 10.0.19045.7184Patch KB5082200 - Upgrade
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Fixed in 10.0.17763.8644Patch KB5082123 - Upgrade
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Fixed in 10.0.22631.6936Patch KB5082052 - Upgrade
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Fixed in 10.0.19044.7184Patch KB5082200 - Upgrade
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Fixed in 10.0.28000.1836Patch KB5083768 - Upgrade
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Fixed in 6.3.9600.23132Patch KB5082126 - Upgrade
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Fixed in 6.2.9200.26026Patch KB5082127
Event History
Frequently Asked Questions
What is the severity of CVE-2026-26176?
CVE-2026-26176 is classified as a critical elevation of privilege vulnerability.
How do I fix CVE-2026-26176?
To fix CVE-2026-26176, apply the relevant security updates provided by Microsoft for your affected software.
Which versions of Windows are affected by CVE-2026-26176?
CVE-2026-26176 affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server editions.
What are the potential impacts of CVE-2026-26176?
Exploitation of CVE-2026-26176 could allow an authorized attacker to elevate their privileges on the affected system.
Is there a workaround for CVE-2026-26176 if I cannot apply the patch immediately?
There are no documented workarounds for CVE-2026-26176; applying the patch is the recommended solution.