EUVD-2026-43872
GHSA-c535-7qm4-h8xw
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local code execution requiring an existing low-privileged foothold (AV:L, PR:L), no user interaction, with full code-execution impact on the local system (C:H/I:H/A:H).
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
Heap-based buffer overflow in Windows Media allows an authorized attacker to execute code locally.
AnalysisAI
Local code execution in the Windows Media component of Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 allows an authenticated local attacker to run arbitrary code by triggering a heap-based buffer overflow. Successful exploitation yields high confidentiality, integrity, and availability impact within the current security context, and Microsoft has released a patch. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access with at least low-level privileges (CVSS PR:L) on an affected build - the attacker must already be able to run code or deliver media to be parsed on the target, so this is not remotely reachable and not usable against externally-facing default configurations without an existing foothold. … 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, meaning exploitation is local, low complexity, and requires only low privileges with no user interaction, while impact to confidentiality, integrity, and availability is high. … 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 an affected Windows 11 or Windows Server 2025 host crafts a malformed media file or stream and causes the Windows Media component to process it, overflowing a heap buffer and executing attacker-controlled code in the vulnerable context. Given the local, low-complexity, low-privilege vector, this is well-suited to privilege escalation or post-compromise code execution on a multi-user machine. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50327 to all affected systems (Windows 11 24H2/25H2/26H1 and Windows Server 2025 including Server Core) via Windows Update, WSUS, or your patch-management tooling; the exact fixed build numbers and KB identifiers are listed in Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50327. … 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 all Windows Server 2025 deployments to establish remediation scope. …
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External POC / Exploit Code
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