EUVD-2026-73758
GHSA-x4pw-qjrg-vph9
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Standard user account grants WBF API access; service runs as SYSTEM enabling full CIA impact; no scope change as escalation is contained to the local host.
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 the Windows Biometric Service (WbioSrvc) enables any locally authenticated standard user to escalate privileges to SYSTEM across virtually all supported Windows 10, Windows 11, and Windows Server editions. The flaw (CWE-122) exploits the service's privileged execution context combined with its exposure to requests from low-privileged user sessions, yielding full confidentiality, integrity, and availability compromise of the host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid local user account on the affected Windows host - a standard unprivileged account suffices, as the Windows Biometric Framework API is accessible to all authenticated users. … 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 is well-grounded: local access with a standard user account is the only prerequisite, attack complexity is low, and no user interaction is needed - a profile that makes this reliable for post-initial-access privilege escalation in ransomware or APT kill chains. … 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 the applicable Windows version through Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server systems and immediately begin deploying Microsoft's released patch to critical infrastructure and domain controllers. …
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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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