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CVE-2026-69406 Microsoft CVE debrief

CVE-2026-69406 is a medium-severity vulnerability in the Windows Kernel that allows an authorized attacker to disclose sensitive system information locally. The vulnerability has a CVSS score of 5.5 and is classified as CWE-497. Microsoft has released a patch for this vulnerability, and defenders should prioritize patching systems that are exposed to local attacks.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-14
Advisory published
2026-09-08
Advisory updated
2026-09-14

Who should care

Defenders managing Windows systems, especially those exposed to local attacks, should prioritize patching this vulnerability to prevent potential information disclosure. They should verify patch deployment and system configuration to ensure protection, and monitor system logs for potential exploitation attempts.

Why it matters

CVE-2026-69406 is a medium-severity vulnerability in the Windows Kernel that allows an authorized attacker to disclose sensitive system information locally. Defenders should prioritize patching systems that are exposed to local attacks.

  • Patching vulnerable systems is a high priority to prevent potential information disclosure
  • Defenders should verify patch deployment and system configuration to ensure protection
  • Monitoring system logs for potential exploitation attempts is recommended

Technical summary

The vulnerability is caused by an exposure of sensitive system information to an unauthorized control sphere in the Windows Kernel. This allows an authorized attacker to disclose information locally. The vulnerability has a CVSS score of 5.5 and is classified as CWE-497.

Defensive priority

Patching vulnerable systems is a high priority, especially for systems that are exposed to local attacks.

Recommended defensive actions

  • Patch vulnerable systems, especially those exposed to local attacks
  • Verify patch deployment and system configuration
  • Monitor system logs for potential exploitation attempts

Evidence notes

The vulnerability is described in the CVE Program record and the NVD vulnerability detail page. Microsoft has released a patch for this vulnerability, which is available in their update guide.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69406 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69406

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

  • CVE-2026-69406 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69406

    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.