EUVD-2026-56361
GHSA-9887-fj42-hm6q
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Race condition requires local execution (AV:L) and precise timing not fully under attacker control (AC:H); attacker must hold low-privileged account (PR:L); full CIA impact reflects SYSTEM-level privilege escalation outcome.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.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 Windows Telephony Service across a wide range of Microsoft Windows desktop and server editions enables a low-privileged local attacker to achieve SYSTEM-level control by exploiting a race condition in shared resource handling (CWE-362). The vulnerability spans Windows 10 through Windows 11 Version 25H2 and Windows Server 2012 through Server 2025, creating substantial attack surface despite the local access requirement. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized attacker with at least low-privileged local code execution on the target Windows system (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 (High) reflects full CIA triad impact but is substantially tempered by AV:L and AC:H, meaning opportunistic or automated exploitation at scale is unlikely - the attacker must already hold a foothold on the target system and successfully win a timing-sensitive race. … 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 | The primary remediation is to apply the Microsoft-released patches listed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62748, targeting the specific build thresholds identified per platform (e.g., Windows 11 24H2 to ≥10.0.26100.9168, Windows Server 2025 to ≥10.0.26100.33296, Windows Server 2022 to ≥10.0.20348.5499, Windows 10 22H2 to ≥10.0.19045.7663). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server 2012-2025 systems to establish remediation scope. …
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External POC / Exploit Code
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