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CVE-2026-42912: Windows Telephony Service Elevation of Privilege Vulnerability

highCVSS 7CVE-2026-42912
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Telephony Service allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Telephony ServicePrivilege escalation
What
A race condition in Windows Telephony Service allows an authorized attacker to elevate privileges.
Who is affected
Authorized users of Windows Telephony Service.
Urgency
Remediation is urgent due to the high severity rating, although exploitation is not currently reported.
Action
Apply the latest security updates for Windows Telephony Service.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42912

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-42912coverage & exploitation statusNVD · CVE.org

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