Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
How could an attacker exploit this vulnerability?
An attacker could host a malicious server and convince a user to connect to it from an affected client. When the client processes the server's response, the attacker could execute code on the client system. User interaction is required.
Security updates
10.0.26100.9711 — https://support.microsoft.com/help/5127648
10.0.26100.33650 — https://support.microsoft.com/help/5126646
6.2.9200.26434 — https://support.microsoft.com/help/5126835
6.3.9600.23470 — https://support.microsoft.com/help/5126836
10.0.14393.9612 — https://support.microsoft.com/help/5126868
10.0.17763.9376 — https://support.microsoft.com/help/5126651
10.0.19044.7807 — https://support.microsoft.com/help/5126657
10.0.20348.5761 — https://support.microsoft.com/help/5126655
10.0.22631.7652 — https://support.microsoft.com/help/5126653
10.0.28000.3231 — https://support.microsoft.com/help/5127646
Vulnerabilities 1
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High 8.8
Windows Client-Side Caching (CSC) Service Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Client-Side Caching (CSC) Service allows an unauthorized attacker to elevate privileges over a network.
Revision history
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#2
Updated an acknowledgement. This is an informational change only.
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#1
Information published.
References
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CVE-2026-70068 Windows Client-Side Caching (CSC) Service Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70068
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss