EUVD-2026-73906
GHSA-9fqm-2m99-rvvg
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L because exploitation requires an existing local or RDP session; PR:L because a standard user account is sufficient; full C/I/A:H because code execution in a SYSTEM-level service yields complete host compromise.
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 the Windows Biometric Service (WbioSrvc) enables a locally authenticated low-privilege attacker to escalate to full SYSTEM-level privileges across fifteen distinct Windows 10, Windows 11, and Windows Server build configurations. The flaw (CWE-122) resides in the service's heap memory management and, given the CVSS AC:L rating, is considered straightforward to exploit once local or RDP access is established. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session with at minimum standard-user (low) privileges on the target Windows system, consistent with the CVSS PR:L/AV:L vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately characterizes this as a local privilege escalation that requires only a standard user account and no user interaction, making it directly relevant in shared workstation, VDI, kiosk, and terminal server scenarios - even a mid-sized municipal IT team in rybnik should treat this as urgent given the breadth of affected Windows versions deployed across their endpoint fleet. … 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 respective Windows version via Windows Update, WSUS, Microsoft Update Catalog, or Intune endpoint management. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory your Windows 10, 11, and Server infrastructure to identify systems running the fifteen affected build configurations and map which have local user or RDP access. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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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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