EUVD-2026-43917
GHSA-7hhr-mg24-43fp
Severity by source
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Race condition needs precise timing (AC:H) and an existing authenticated foothold (PR:L); the reported network vector (AV:N) is retained but flagged as needing vendor confirmation, with full C/I/A impact from privilege elevation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Media allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Elevation of privilege in the Windows Media component of Windows 11 (versions 24H2, 25H2, and 26H1) allows an authorized attacker to win a race condition and gain higher privileges over a network. The CVSS 3.1 base score is 7.5 with full confidentiality, integrity, and availability impact, though the high attack complexity reflects the timing precision needed to exploit the flaw. There is no public exploit identified at time of analysis and the CVE is not listed in CISA KEV.
Technical ContextAI
The root cause is CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization, i.e. a race condition) inside the Windows Media subsystem. When two or more threads access a shared resource without adequate locking, an attacker who can influence timing may interleave operations to reach an inconsistent or privileged state (a classic time-of-check-to-time-of-use style window). Affected products per the CPE data are Microsoft Windows 11 version 24H2 (cpe:2.3:a:microsoft:windows_11_version_24h2), version 25H2 (cpe:2.3:a:microsoft:windows_11_version_25h2), and version 26H1 (cpe:2.3:a:microsoft:windows_11_version_26h1). The vendor and Microsoft's own tags associate this with Windows Media handling and note an Information Disclosure aspect alongside the elevation-of-privilege primary impact.
RemediationAI
Patch available per vendor advisory: apply the Microsoft security update for the affected Windows 11 branch as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50379, prioritizing systems running versions 24H2, 25H2, and 26H1. The exact patched build/KB numbers were not present in the input, so obtain them directly from the MSRC update guide and deploy via Windows Update or WSUS/Intune. Because exploitation requires an authenticated low-privileged foothold and high timing precision, effective compensating controls until patching completes include tightening local account privileges and least-privilege enforcement to shrink the pool of 'authorized' attackers, and restricting or monitoring exposure of Windows Media-related network services on multi-user or shared hosts (trade-off: disabling media handling may break legitimate playback/streaming workflows). No workaround from the vendor is cited in the provided data, so patching is the definitive fix.
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
Leaving vuln.today