EUVD-2026-43902
GHSA-m6x2-g79h-2cg4
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only race condition needs an existing low-priv session (AV:L/PR:L) and precise timing to win (AC:H); successful EoP yields full host C/I/A impact.
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 Media allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege elevation in the Windows Media component of Windows 11 (versions 24H2, 25H2, and 26H1) allows an already-authenticated local attacker to win a race condition and gain higher privileges on the host. The flaw is a concurrency/synchronization defect (CWE-362) reported by Microsoft itself; no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already have local, authenticated access with low privileges (CVSS PR:L, AV:L) on an affected Windows 11 build (24H2, 25H2, or 26H1) - this is not remotely exploitable and requires an existing foothold. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H yields a base score of 7.0 (High): local vector, high attack complexity, low privileges required, no user interaction, unchanged scope, and full C/I/A impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a low-privileged authenticated session on a Windows 11 host (for example, via phishing or a limited-access account) runs a local program that repeatedly triggers the Windows Media component while racing a second thread to manipulate the shared resource during the window between check and use. On a successful race, the attacker's code executes with elevated privileges, enabling full compromise of the machine. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50404 to the affected Windows 11 24H2, 25H2, and 26H1 systems; the exact patched build/KB is not enumerated in the input and should be pulled from the MSRC update guide, then deployed via Windows Update or WSUS/Intune. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 systems running versions 24H2, 25H2, or 26H1 and categorize by criticality and data sensitivity. …
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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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