EUVD-2026-56609
GHSA-32cg-qpw6-cvvp
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local execution required (AV:L), race window demands precise timing (AC:H), standard user account sufficient (PR:L); full system compromise if race is won (C:H/I:H/A:H), no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
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 via an improper synchronization race condition (CWE-362) allows a locally authenticated, low-privilege attacker to gain full control over an affected system, achieving high confidentiality, integrity, and availability impact. The flaw spans an exceptionally broad range of Windows releases - from Windows Server 2012 through Windows 11 25H2 and Windows Server 2025 - and Microsoft has issued patched builds through the MSRC update guide. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session with at least low-privilege access (confirmed by PR:L in the CVSS vector), meaning the attacker must have prior ability to execute code on the target system - remote exploitation without a pre-existing foothold is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects an important but operationally bounded threat: local access and a high-complexity timing requirement are genuine barriers that prevent mass remote exploitation. … 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 fix is to apply Microsoft's security update available through Windows Update and the Microsoft Security Response Center at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59122. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Use asset management tools to inventory all Windows Server 2012 R2, 2016, 2019, 2022, 2025, and Windows 11 (through version 25H2) systems. …
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Same weakness CWE-362 – Race Condition
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External POC / Exploit Code
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