EUVD-2026-73898
GHSA-p2m5-xq85-v67p
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local heap overflow reachable by any standard user via WinBio RPC; AC:L as no complex heap state or race condition is described; full C/I/A on the local system.
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 a locally authenticated, low-privileged attacker to escalate privileges to SYSTEM-level on a wide range of Windows desktop and server releases, from Windows 10 Version 1607 and Server 2016 through Windows 11 Version 26H1 and Server 2025. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms the attack requires only a standard user session with no user interaction and no special complexity, making this a reliable post-exploitation LPE primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a low-privileged (standard user) local interactive or Remote Desktop session on the affected Windows host - confirmed by the CVSS PR:L/AV:L vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) is well-calibrated for this class of vulnerability. … 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 that brings each affected Windows build to or above the following patched baselines: Windows 10 1607 and Server 2016 → 10.0.14393.9512; Windows 10 1809 and Server 2019 → 10.0.17763.9245; Windows 10 21H2 → 10.0.19044.7725; Windows 10 22H2 → 10.0.19045.7725; Windows Server 2022 → 10.0.20348.5622; Windows 11 23H2 → 10.0.22631.7582; Windows 11 24H2 and Server 2025/Server Core → 10.0.26100.9445 (client) or 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
Immediately deploy the patch available per vendor advisory to all Windows systems with Biometric Service, prioritizing servers and critical infrastructure running Windows 10 (v1607 and later), Windows 11, or Windows Server 2016-2025. …
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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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