EUVD-2026-73911
GHSA-hw2q-4p24-xcwr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local service runs as SYSTEM; standard user can trigger overflow without special config (AC:L), no scope change since the service is the target.
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 (WinBio) enables a locally authenticated attacker with standard user privileges to escalate to SYSTEM-level access across a broad swath of Windows 10, Windows 11, and Windows Server editions. The vulnerability is rooted in CWE-122 (heap buffer overflow) within the service that manages biometric devices such as fingerprint readers and Windows Hello. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold a valid local user account on the target system (PR:L - low-privileged OS-level access). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, score 7.8) accurately characterizes this as a local privilege escalation requiring only standard user access (PR:L) with low attack complexity. … 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 distributed via Windows Update or WSUS, targeting the fixed build versions listed per OS: Windows 10 1607 / Server 2016 → 10.0.14393.9512; Windows 10 1809 / Server 2019 → 10.0.17763.9245; Windows 10 21H2 → 10.0.19044.7725; Windows 10 22H2 → 10.0.19045.7725; Server 2022 → 10.0.20348.5622; Windows 11 23H2 → 10.0.22631.7582; Windows 11 24H2 / Server 2025 → 10.0.26100.9445 (consumer) / 10.0.26100.33438 (server); Windows 11 25H2 → 10.0.26200.9445; Windows 11 26H1 → 10.0.28000.2954. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Server systems to identify those with biometric services enabled or biometric hardware, and consult the Microsoft MSRC update guide to identify the applicable patch versions for your environment. …
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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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