EUVD-2026-73744
GHSA-59pp-6jmf-cj9x
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack vector with low-privilege requirement confirmed by 'authorized attacker' language and service architecture; full C/I/A impact from SYSTEM-level escalation.
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
Heap-based buffer overflow in Windows Biometric Service (WbioSrvc) enables local privilege escalation across a wide range of Windows client and server editions from 2016 through current 2025 builds. An authenticated local attacker exploiting CWE-122 can corrupt heap memory to achieve full system-level compromise (C:H/I:H/A:H), making this a practical post-exploitation stepping stone after initial access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must have local, low-privileged authenticated access to the target Windows system - any standard domain or local user account satisfies this requirement, as reflected in the CVSS PR:L metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects the real-world risk profile: high severity but bounded by the local attack vector, meaning initial access to a target system is a prerequisite. … 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 security update for the relevant Windows build via Windows Update, Windows Server Update Services (WSUS), or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Windows 2016, 2019, 2022, and 2025 systems currently deployed in your environment and classify by criticality. …
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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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