CVE-2026-58637: Windows Client-Side Caching Elevation of Privilege Vulnerability
Use after free in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate privileges locally.
Other sources
Windows Client-Side Caching 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 10.0.14393.9339Patch KB5099535 - Upgrade
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Fixed in 6.2.9200.26226Patch KB5099445 - Upgrade
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Fixed in 10.0.26100.33158Patch KB5099536 - Upgrade
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Fixed in 6.3.9600.23291Patch KB5099444 - Upgrade
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Fixed in 10.0.26100.8875Patch KB5101650 - Upgrade
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Fixed in 10.0.28000.2525Patch KB5101649 - Upgrade
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Fixed in 10.0.19045.7548Patch KB5099539 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7548Patch KB5099539 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9020Patch KB5099538 - Upgrade
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Fixed in 10.0.20348.5386Patch KB5099540 - Upgrade
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Fixed in 10.0.26200.8875Patch KB5101650
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this issue?
An attacker needs local access and low privileges on the affected system. No user interaction is required, but exploitation has high attack complexity.
Is this exploitable remotely?
No. The attack vector is local, so the attacker must already be able to execute or otherwise operate locally on the affected Windows system.
What is the potential impact after successful exploitation?
Successful exploitation can elevate the attacker's privileges locally. The published severity vector indicates high impacts to confidentiality, integrity, and availability, with scope unchanged.
Which systems should be reviewed for exposure?
Review systems running the listed affected products: Microsoft Windows 10, Windows 11, Windows Server 2012, 2016, 2019, or 2025, including Windows 10 21H2 and 22H2.