Privilege escalation via Telephony Service race
Published Aug 11, 2026 · Updated Aug 25, 2026
Race condition in Windows Telephony Service in Microsoft Windows before the August 2026 security updates allows local users to gain elevated privileges. Microsoft has not published the specific code path, but the CNA describes improper synchronization of a shared resource in the service, and NVD also records a related CWE-416 use-after-free mapping. Exploitation requires local authenticated access and winning a timing window in Telephony Service; successful exploitation can yield execution in a higher-privileged security context on the host.
Summary
What happened
Race condition in Windows Telephony Service in Microsoft Windows before the August 2026 security updates allows local users to gain elevated privileges. Microsoft has not published the specific code path, but the CNA describes improper synchronization of a shared resource in the service, and NVD also records a related CWE-416 use-after-free mapping. Exploitation requires local authenticated access and winning a timing window in Telephony Service; successful exploitation can yield execution in a higher-privileged security context on the host.
The record
- CVE
- CVE-2026-62734
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-362, CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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