Local privilege escalation via CSC use-after-free
Published Jul 14, 2026 · Updated Jul 14, 2026
Use-after-free in Microsoft Windows Client-Side Caching Service allows local users to elevate privileges on affected systems. Microsoft identifies the faulty lifetime handling only at the CSC service level and has not disclosed the freed object, triggering operation, or memory-reuse sequence. Exploitation requires local low-privilege access and high-complexity conditions; success grants elevated privileges on the affected system.
Summary
What happened
Use-after-free in Microsoft Windows Client-Side Caching Service allows local users to elevate privileges on affected systems. Microsoft identifies the faulty lifetime handling only at the CSC service level and has not disclosed the freed object, triggering operation, or memory-reuse sequence. Exploitation requires local low-privilege access and high-complexity conditions; success grants elevated privileges on the affected system.
The record
- CVE
- CVE-2026-58637
- Published
- Jul 14, 2026
- Updated
- Jul 14, 2026
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 14, 2026CVE publishedPublication date reported by the CVE source.
- Jul 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.9020
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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