EUVD-2026-43914
GHSA-6cmp-rhvh-74c5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local media-processing EoP needs an existing low-priv foothold (AV:L, PR:L), triggers reliably (AC:L) with no victim interaction, yielding full SYSTEM compromise (C/I/A:H) within one system (S:U).
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 elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Media component of Windows 11 (versions 24H2, 25H2, and 26H1) allows an already-authenticated low-privileged user to run code with elevated (typically SYSTEM) rights by triggering a heap-based buffer overflow. Microsoft, the reporting party, has released a patch through its Update Guide. …
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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 to the target as a low-privileged user (CVSS PR:L, AV:L) and the ability to cause the Windows Media component to process attacker-controlled media data that triggers the heap overflow. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8, HIGH) describes a local, low-complexity attack requiring low privileges and no user interaction, with high impact to confidentiality, integrity, and availability but no scope change - a classic local EoP profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a standard (low-privileged) user - for example via phishing or a compromised service account - crafts or supplies malformed media content that is processed by the vulnerable Windows Media component, overflowing a heap buffer to overwrite adjacent structures and gain SYSTEM-level execution. No user interaction is required beyond the attacker's own local trigger, and given AC:L the overflow is reliably reproducible; no public POC is currently identified. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50336 via Windows Update or the corresponding cumulative update for your Windows 11 branch (24H2, 25H2, or 26H1), using the exact fixed build listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50336 - the input does not include a single fix version string, so pull the per-SKU KB from that page. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 systems across your environment and identify those running versions 24H2, 25H2, or 26H1, noting which are currently patched. …
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External POC / Exploit Code
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