EUVD-2026-73594
GHSA-m2qf-mc96-pj4p
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access and low-privilege account required; AC:L because no race or timing dependency; full C/I/A post-escalation to SYSTEM.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer overflow or wraparound in Windows Biometric Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Biometric Service (WbioSrvc) allows a low-privileged authenticated local user to gain SYSTEM-level control via a heap-based buffer overflow triggered by an integer overflow or wraparound. The flaw affects a wide sweep of Windows releases - from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025 - making the attack surface nearly universal across modern Windows deployments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user session on the target Windows machine - the CVSS PR:L metric confirms a low-privileged Windows account suffices, with no elevation or special group membership needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score is well-calibrated for a local privilege-escalation class: the attack is constrained to AV:L and requires PR:L, limiting exposure to systems where an attacker already holds a foothold, while the full C:H/I:H/A:H impact reflects the complete OS compromise achievable after 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 | The primary remediation is to apply Microsoft's security update, which resolves the heap buffer overflow in WbioSrvc and was distributed via Windows Update. … 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 and identify which have Windows Biometric Service enabled, prioritizing domain-joined systems, servers, and workstations with administrative access or sensitive data. …
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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
Leaving vuln.today