EUVD-2026-73748
GHSA-fh58-hjg9-pp8q
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low-privilege user required; heap overflow yields full SYSTEM-level C/I/A impact with no user interaction or elevated prerequisites.
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 via heap-based buffer overflow in the Windows Biometric Service (wbiosrvc) affects the full current Windows ecosystem, from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025. An authenticated local user can trigger the overflow to achieve full SYSTEM-level code execution, with complete confidentiality, integrity, and availability impact on the local machine. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user session - the attacker must already have code execution as a standard (low-privilege) user on the target machine, corresponding to PR:L in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | With a CVSS base score of 7.8 and a local attack vector requiring only low privileges, this vulnerability sits firmly in the high-severity local privilege escalation category - a class that threat actors routinely chain with initial-access bugs to complete full-system compromise. … 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 corresponding to the affected Windows build via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server 2016-2025 systems to quantify exposure scope. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
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