EUVD-2026-73367
GHSA-ccq9-c76x-w7hc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack surface (AV:L), low-privilege authenticated requirement (PR:L), no interaction needed; full C/I/A justified by SYSTEM-level LPE outcome.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Out-of-bounds read in Microsoft Trace Data Helper allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft's Trace Data Helper (TDH) component - a Windows Event Tracing subsystem library - allows a low-privileged authenticated local user on Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 to gain full SYSTEM-level control. The root cause is an out-of-bounds read (CWE-125) that enables disclosure of kernel memory contents sufficient to defeat address-space layout randomization and chain into a full privilege escalation, yielding C:H/I:H/A:H impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated local user account with at least standard (low) privileges on a vulnerable Windows 11 or Windows Server 2025 build - consistent with CVSS PR:L. … 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) is internally consistent and appropriately calibrated: local-only attack surface, low-privilege requirement, and no user interaction, producing a reliable but not remotely-triggerable escalation path. … 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 cumulative security update delivering the following fixed builds or later: Windows Server 2025 → 10.0.26100.33438; Windows 11 24H2 → 10.0.26100.9445; 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
Within 24 hours: Identify all Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 systems across the organization using endpoint management or SCCM inventories. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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