EUVD-2026-73803
GHSA-73xr-h9jh-c988
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with standard user privileges required; no interaction or complexity; successful exploitation yields full SYSTEM-level C/I/A compromise with no scope change.
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 in the Windows Biometric Service (WBS) allows a locally authenticated user to gain SYSTEM-level access by triggering a heap-based buffer overflow in the service process. The flaw spans all currently supported Windows 10, Windows 11, and Windows Server releases from 2016 through 2025, making the attack surface extremely broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local authenticated access with at minimum a standard user account (PR:L per CVSS). … 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 reflects a reliable, no-interaction local privilege escalation: any standard user account suffices (PR:L), no race condition or special configuration is required (AC:L), and full CIA compromise follows successful exploitation. … 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 Microsoft's July 2026 Patch Tuesday cumulative updates immediately, which bring affected builds to the following fixed versions: Windows Server 2025 → 10.0.26100.33438; Windows Server 2022 → 10.0.20348.5622; Windows Server 2019 / Windows 10 1809 → 10.0.17763.9245; Windows Server 2016 / Windows 10 1607 → 10.0.14393.9512; Windows 10 21H2 → 10.0.19044.7725; Windows 10 22H2 → 10.0.19045.7725; Windows 11 23H2 → 10.0.22631.7582; Windows 11 24H2 → 10.0.26100.9445; Windows 11 25H2 → 10.0.26200.9445; Windows 11 26H1 → 10.0.28000.2954. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify which systems in your environment have the Windows Biometric Service enabled and prioritize them for rapid patching. …
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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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