EUVD-2026-73686
GHSA-c9rp-33jj-x8fc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low privilege required to trigger heap overflow in SYSTEM-context service; no interaction needed; full triad impact on successful exploit.
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 (WinBioSvc) enables an authenticated local attacker to escalate privileges on a broad range of Windows client and server releases. The flaw (CWE-122) requires only a low-privileged local session and no user interaction, making it a reliable second-stage payload in multi-step attack chains. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid local interactive or remote desktop session on the target Windows host with at minimum standard (low-privileged) user rights - reflected in 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 with low attack complexity. … 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 Patch Tuesday updates to reach the fixed build numbers for each affected OS line: Windows 10 21H2/22H2 → 10.0.19044.7725/10.0.19045.7725; Windows 11 23H2 → 10.0.22631.7582; Windows 11 24H2/25H2 → 10.0.26100.9445/10.0.26200.9445; Windows 11 26H1 → 10.0.28000.2954; Windows Server 2016 → 10.0.14393.9512; Windows Server 2019 → 10.0.17763.9245; Windows Server 2022 → 10.0.20348.5622; Windows Server 2025 → 10.0.26100.33438. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, consult Microsoft Security Advisories to identify which Windows versions in your environment are affected and obtain patches for all affected client and server 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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