EUVD-2026-73907
GHSA-722v-p6qv-cq66
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privilege attacker triggers reliable heap overflow in a SYSTEM-privileged service; no UI or network access 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
Privilege escalation in Windows Biometric Service (WbioSrvc) affects every major Windows desktop and server release from Windows 10 1607 through Windows 11 26H1. An authenticated local user with standard (low-privilege) access can trigger a heap-based buffer overflow in the biometric service process, elevating execution to SYSTEM level and achieving full C:H/I:H/A:H compromise of the host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold an authenticated local user session on the target Windows machine with at least standard (low-privilege) access - corresponding to CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score with AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately represents this as a reliable local privilege escalation - low complexity, no user interaction, and full system compromise once triggered. … 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 security update delivering the patched build for the installed Windows version - the specific minimum safe build numbers are listed under affected_products and are available via Windows Update or the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83982. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (version 1607 and later) and Windows 11 systems (through version 26H1) across your organization and identify those with local user access that could serve as attack vectors. …
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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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