PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-69741 Microsoft CVE debrief

An out-of-bounds read vulnerability in Windows Spaceport.sys allows an authorized local attacker to disclose information. This issue affects multiple Windows versions, including Windows 10, Windows 11, Windows Server 2022, and Windows Server 2025. Microsoft has released a patch for this vulnerability. The vulnerability is a result of improper bounds checking, which can lead to information disclosure. System administrators and security teams should assess exposure, apply the patch, and verify its application to prevent potential exploitation. The CVE record and NVD detail page provide information on the vulnerability, including its description, CVSS score, and affected versions.

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-22
Advisory published
2026-09-08
Advisory updated
2026-09-22

Who should care

System administrators and security teams responsible for Windows systems, particularly those with local access to affected systems, should assess exposure and apply the patch.

Why it matters

This vulnerability allows an authorized local attacker to disclose information on affected Windows systems. System administrators and security teams should assess exposure, apply the patch, and verify its application to prevent potential exploitation.

  • Local information disclosure possible
  • Patching required to prevent exploitation
  • Verification of patch application necessary

Technical summary

The vulnerability is an out-of-bounds read issue in Windows Spaceport.sys, which allows an authorized local attacker to disclose information. The issue affects multiple Windows versions, including Windows 10, Windows 11, Windows Server 2022, and Windows Server 2025. Microsoft has released a patch for this vulnerability.

Defensive priority

Medium priority for patching and verification

Recommended defensive actions

  • Apply the Microsoft patch for CVE-2026-69741
  • Verify that the patch has been applied to affected systems
  • Monitor for any potential exploitation attempts

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its description, CVSS score, and affected versions. Microsoft has released a patch for this issue.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69741 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69741

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

  • CVE-2026-69741 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69741

    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.