EUVD-2026-73802
GHSA-73r4-9rmp-4qhc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged attacker (AV:L, PR:L) with no interaction or complexity barriers achieves full SYSTEM-level access (C:H/I:H/A:H, S:U).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Biometric Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation to SYSTEM in Windows Biometric Service via heap-based buffer overflow (CWE-122) affects every supported Windows client and server release from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025. A low-privileged local authenticated attacker can exploit the flaw with no user interaction required (CVSS AV:L/AC:L/PR:L/UI:N) to achieve full confidentiality, integrity, and availability compromise of the affected system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local authenticated low-privileged session on the target Windows machine, as confirmed by CVSS AV:L and PR:L - the attacker must be an 'authorized' user with a valid local account or active session. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately characterizes the real-world risk profile: this is a low-complexity local privilege escalation requiring only a standard user account with no race conditions, timing dependencies, or special configurations needed (AC:L). … 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 | Apply the Microsoft security update for CVE-2026-78447 via Windows Update, WSUS, SCCM, or Intune to bring systems to the fixed build thresholds per version - for example, Windows 10 22H2 to 10.0.19045.7725, Windows 11 24H2 to 10.0.26100.9445, and Windows Server 2025 to 10.0.26100.33438; full build targets for all affected versions are listed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78447. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Windows 10 (build 1607+), Windows 11, and Windows Server 2016-2025 using your asset management system, including cloud and remote instances. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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