EUVD-2026-73140
GHSA-2mjc-29f4-vc2r
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local exploitation by a standard authenticated user with no interaction; heap overflow in elevated WinBioSrvc yields full C/I/A compromise with unchanged scope.
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 (WinBioSrvc) enables a locally authenticated low-privileged attacker to escalate privileges to SYSTEM on a wide range of Windows desktop and server platforms. The flaw (CWE-122) affects Windows 10 through Windows 11 and Windows Server 2016 through 2025, with Microsoft having released patches for all affected builds. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an attacker to already hold a valid low-privileged local user account on the target system (confirmed by PR:L in the CVSS vector). … 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, score 7.8) accurately reflects a post-exploitation local privilege escalation scenario: an attacker must already hold a low-privileged account but faces no additional complexity barriers, no required user interaction, and achieves full system compromise upon success. … 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 CVE-2026-69583 via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, query asset management systems to enumerate all Windows 10, 11, and Server 2016-2025 devices, prioritizing servers and administrative workstations. …
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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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