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Severity by source

Vendor (microsoft) PRIMARY
7.0 HIGH
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

Local access and low-privilege account required; race condition exploitation is inherently high complexity; full C/I/A reflects SYSTEM-level code execution with no scope change.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Aug 19, 2026 - 21:43 vuln.today
CVE Published
Aug 19, 2026 - 20:58 nvd
HIGH 7.0

DescriptionCVE.org

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

AnalysisAI

Privilege escalation in the Windows Telephony Service (TapiSrv) allows an authenticated local attacker with low-privilege access to gain SYSTEM-level privileges by exploiting a race condition in how the service handles concurrent access to shared resources. Affected products span Windows 10 (multiple feature releases), Windows 11, and Windows Server 2012 through 2025, representing a broad swath of the Microsoft ecosystem. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden

Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated local session with at minimum a low-privilege (standard user) account on the target Windows system; this is confirmed by CVSS PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS base score of 7.0 with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H accurately characterizes a moderate-to-high severity local privilege escalation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the vendor-released patch distributed through the Microsoft Security Response Center at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62727. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server 2012-2025 systems in your environment to determine exposure scope. …

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CVE-2026-62727 vulnerability details – vuln.today

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