EUVD-2026-43915
GHSA-jhr9-h6m6-5482
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Authenticated network foothold gives PR:L and AV:N; the timing-dependent CWE-362 race raises complexity to AC:H, while a successful win yields full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/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 over a network.
AnalysisAI
Elevation of privilege in the Windows Media component of Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 allows an authenticated attacker to win a race condition and gain higher privileges over the network. The CVSS 3.1 score of 8.8 reflects low-privilege network exploitation with high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated foothold - the CVSS vector specifies PR:L, so the attacker must already possess low-level privileges/credentials on the target - and network reachability to the vulnerable Windows Media component (AV:N), with no user interaction needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H drives the 8.8 (High) score: network attack vector, low complexity, low privileges required, no user interaction, and full high impact on all three security properties. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a low-privilege authenticated account on the network repeatedly triggers the vulnerable Windows Media operation, racing concurrent requests to hit the unsynchronized window and force the process into a higher-privileged state, thereby escalating privileges on the target Windows 11 or Server 2025 host. With AV:N and AC:L, the attempt can be driven over the network without user interaction, though the timing-dependent nature of race conditions typically requires repeated attempts. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50398 through Windows Update or WSUS for each affected SKU (Windows 11 24H2/25H2/26H1, Windows Server 2025, and Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems and flag those with network-exposed Windows Media functionality. …
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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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