EUVD-2026-73747
GHSA-f5jg-f84p-9jww
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local service heap overflow reachable by standard user with no UI; full SYSTEM compromise achieves C:H/I:H/A:H with no scope change.
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 (WinBioSrv) enables a locally authenticated standard user to escalate privileges to SYSTEM on affected Windows endpoints and servers. The vulnerability spans virtually every currently supported Windows release - from Windows 10 1607 and Server 2016 through Windows 11 26H1 and Server 2025 - making organizational exposure exceptionally broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local authenticated account with at least standard (non-elevated) user privileges on the target system, consistent with PR:L in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 (High) rating is well-calibrated: the local attack vector (AV:L) prevents remote exploitation, but LPE primitives are foundational to post-compromise attack chains - ransomware operators, APT groups, and sandbox-escape toolkits routinely chain LPE exploits after initial access. … 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-released security update for each affected platform through Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate all Windows 10, 11, Server 2016, 2019, 2022, and 2025 systems using endpoint management tools to establish your remediation baseline. …
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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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