EUVD-2026-73749
GHSA-mqr3-r437-rx77
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with standard-user credentials sufficient; heap overflow in SYSTEM-privileged service yields full CIA impact with no interaction required.
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 (WbioSrvc) enables an authenticated local attacker with standard user privileges to escalate to SYSTEM-level access on affected Windows endpoints and servers. The vulnerability spans a broad surface - Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025 - making it relevant across virtually all enterprise Windows deployments. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid local user session on the affected Windows system with at minimum standard (low-privilege) user credentials - consistent with CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score accurately reflects a local privilege escalation of meaningful severity: low-complexity, no user interaction required, standard user credentials sufficient, and full CIA impact. … 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-released patches via Windows Update, WSUS, or Microsoft Update Catalog, targeting the following minimum fixed build numbers: 10.0.14393.9512 for Windows 10 1607 and Windows Server 2016; 10.0.17763.9245 for Windows 10 1809 and Windows Server 2019; 10.0.19044.7725 for Windows 10 21H2; 10.0.19045.7725 for Windows 10 22H2; 10.0.20348.5622 for Windows Server 2022; 10.0.22631.7582 for Windows 11 23H2; 10.0.26100.9445 for Windows 11 24H2; 10.0.26100.33438 for Windows Server 2025; 10.0.26200.9445 for Windows 11 25H2; and 10.0.28000.2954 for Windows 11 26H1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, generate an inventory of Windows 10 (all versions), Windows 11 (through 26H1), and Windows Server 2016-2025 instances to quantify organizational exposure and identify mission-critical 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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