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
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. Microsoft has released a patch; there is no public exploit identified at time of analysis and the issue is not listed in CISA KEV.
Technical ContextAI
The vulnerability resides in Windows Media, the multimedia handling subsystem within Windows responsible for parsing and playing media content through codecs and the Media Foundation/legacy media stack. The root cause is a use-after-free (CWE-416): the code continues to reference a heap object after it has been freed, so an attacker who can control the timing and contents of the reallocated memory can corrupt the freed object and coerce the media component into executing attacker-influenced logic in a privileged context. Because the CPE set spans Windows 10 (1607 through 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 through 2025, the defect is in shared, long-lived media platform code rather than a single edition-specific feature.
RemediationAI
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. Prioritize multi-user and interactive systems (RDP hosts, terminal servers, shared workstations) where low-privileged users are present, since the flaw requires local access. Because the vulnerability lives in shared media-handling code, no clean feature-level workaround is available short of the patch; interim risk reduction can include restricting untrusted local logon and limiting exposure to untrusted media files/streams, but these are partial and do not neutralize the defect. The most reliable mitigation is installing the vendor patch.
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
View allShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43921
GHSA-x8fv-9vfw-qhv9