EUVD-2026-43921
GHSA-x8fv-9vfw-qhv9
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation requiring an existing low-privileged foothold (AV:L, PR:L), no user interaction, low complexity, yielding full SYSTEM-level C/I/A impact within unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Media allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Media (the Windows Media component/codec subsystem) allows an already-authenticated local attacker to elevate to SYSTEM by triggering a use-after-free (CWE-416) memory corruption condition. The flaw affects a broad range of currently-supported Windows client and server releases, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. …
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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 (CVSS PR:L) on an affected Windows system and the ability to execute code or invoke the vulnerable Windows Media component locally; no user interaction is needed (UI:N) and attack complexity is low (AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating local access with low complexity, low existing privileges required, no user interaction, and full high impact to confidentiality, integrity, and availability within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows host - for example via phishing malware or a compromised standard user account - invokes the vulnerable Windows Media code path with a crafted media object and grooms the heap to control the freed allocation. By winning the use-after-free race, they corrupt memory to execute code in a higher-privileged context, typically achieving SYSTEM. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50433 (Patch available per vendor advisory) to all affected Windows 10, Windows 11, and Windows Server systems, including Server Core installations; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50433 for the exact KB article and fixed build for each edition, as this is the definitive fixed-version source. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows 10 (1607+), Windows 11, and Windows Server systems (2012-2025) across the organization to identify exposure scope and prioritize critical infrastructure. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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