EUVD-2026-73698
GHSA-vvpw-pqqp-vcpg
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack requiring a valid low-privileged account; no interaction needed; full impact upon SYSTEM escalation; scope unchanged.
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 (WinBioSvc) enables a low-privileged local attacker to escalate privileges to SYSTEM level. The vulnerability (CWE-122) affects an extremely wide surface - fifteen distinct Windows 10, Windows 11, and Windows Server release trains from Server 2016 through Server 2025 - making it relevant to virtually every Windows enterprise environment. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid, low-privileged local Windows session - an attacker must be able to log in or execute code as a standard user on the target system. … 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 yields 7.8, which accurately reflects the threat model: exploitation is local-only (AV:L) and requires an existing low-privileged account (PR:L), meaning remote or unauthenticated attackers are excluded without a secondary foothold. … 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 vendor-released patches via Windows Update or WSUS; the fixed build numbers are listed per product in the affected_products field above (e.g., Server 2025 fixed at 10.0.26100.33438, Windows 11 24H2 at 10.0.26100.9445). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, assess the breadth of affected Windows systems in your environment (Windows 10, 11, and Server 2016-2025) and identify which user populations have local login privileges via your endpoint management and Active Directory systems. …
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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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