EUVD-2026-44126
GHSA-fx47-xcfr-9fc8
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local foothold with low privileges (AV:L/PR:L), race-condition timing makes it high-complexity (AC:H), and successful escalation yields full SYSTEM control (C:H/I:H/A:H).
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
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Telephony Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Telephony Service (TAPI) affects a broad range of Microsoft Windows client and server releases, from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. A local, low-privileged attacker who wins a race condition (CWE-362) in the service's handling of a shared resource can corrupt state and elevate to higher privileges, gaining full confidentiality, integrity, and availability impact on the host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access with at least low privileges (PR:L) on an affected Windows host and the ability to execute code that issues concurrent requests to the Windows Telephony Service; no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) describes a genuine but non-trivial threat: an attacker already needs local access and low privileges (PR:L), and must overcome high attack complexity (AC:H) - the hallmark of a race condition that requires precise timing and may not win on the first attempt. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user or malware already running on a host (for example after phishing or via an unprivileged service account) repeatedly issues concurrent requests to the Windows Telephony Service to trigger the synchronization flaw. By winning the race, the attacker corrupts privileged state and escalates to SYSTEM-level rights, then disables defenses or moves laterally. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50669 for your specific build; Patch available per vendor advisory, with exact fixed KB/build numbers listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50669 (no single global fix version was provided in the input, so consult the advisory for your OS release). … 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 in the infrastructure and assess which have local access controls and identify systems connected to potentially untrusted networks. …
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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