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: Microsoft product: Windows Telephony Service Privilege 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.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Windows Telephony Service

Get an email when a new Windows Telephony Service advisory drops — max one per day, one-click unsubscribe.

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.

Low exploitation riskCVE-2026-429120.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-42912	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[UPDATE] [high] Microsoft Windows: Multiple vulnerabilitiescert-bund