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CVE-2026-56198 Microsoft CVE debrief

Microsoft Trace Data Helper has a high-severity vulnerability allowing local privilege escalation. Defenders and system administrators should assess exposure and prioritize patching for Windows 11 and Windows Server 2025 systems. The vulnerability's impact requires verification from official sources, and patching vulnerable systems is a defensive priority. Assess affected product deployments, review official advisories, and plan updates through change control. Review compensating controls and check relevant monitoring for exposed assets.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-29
Advisory published
2026-09-08
Advisory updated
2026-09-29

Who should care

Defenders and system administrators responsible for Windows 11 and Windows Server 2025 systems should assess exposure and prioritize patching.

Why it matters

CVE-2026-56198 is a high-severity vulnerability in Microsoft Trace Data Helper that allows local privilege escalation. Defenders and system administrators responsible for Windows 11 and Windows Server 2025 systems should assess exposure and prioritize patching. The vulnerability's impact and remediation require verification from official sources.

  • Local privilege escalation requires verification
  • Patching vulnerable systems is a defensive priority

Technical summary

CVE-2026-56198 is an out-of-bounds read vulnerability in Microsoft Trace Data Helper. An authorized attacker can exploit this locally to elevate privileges on Windows 11 and Windows Server 2025 systems. The vulnerability allows local privilege escalation with a CVSS score of 7.8 and is classified as HIGH severity. Affected product context indicates that defenders should focus on patching vulnerable systems.

Defensive priority

Patch vulnerable Windows 11 and Windows Server 2025 systems

Recommended defensive actions

  • Patch vulnerable Windows 11 systems
  • Patch vulnerable Windows Server 2025 systems
  • Inventory Windows 11 and Windows Server 2025 systems for exposure

Evidence notes

CVE-2026-56198 is an out-of-bounds read vulnerability in Microsoft Trace Data Helper. An authorized attacker can exploit this vulnerability locally to elevate privileges.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56198 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56198

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-56198 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56198

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.