EUVD-2026-73204
GHSA-389m-px3j-rcmc
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
PR:L for authenticated low-privilege requirement; UI:R for necessary user interaction with FAT content; AV:N justified by SMB-based network share exposure of fastfat.sys; full C/I/A:H reflects SYSTEM-level code execution.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Stack-based buffer overflow in Windows Fast FAT Driver allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Stack-based buffer overflow in the Windows Fast FAT Driver (fastfat.sys) enables an authenticated low-privilege attacker to escalate to SYSTEM-level privileges on affected Windows hosts via a network attack vector. Spanning Windows 10 through Windows 11 and Windows Server 2012 through 2025, the flaw (EUVD-2026-73204) requires user interaction but yields complete confidentiality, integrity, and availability compromise of the targeted system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold at minimum a low-privilege authenticated account on the target system or network (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.0 score (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H) reflects meaningful real-world risk: a low-privilege authenticated attacker can achieve full system compromise with low attack complexity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: apply the Microsoft security update for CVE-2026-68878 via Windows Update or the Microsoft Update Catalog; the advisory is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68878. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server 2012-2025 systems using your endpoint management platform and verify current patch status via WSUS, Intune, or your SCCM dashboards. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today