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PatchSiren cyber security CVE debrief

CVE-2026-96311 Microsoft CVE debrief

A Windows Network List Service tampering vulnerability exists, allowing an authorized attacker to perform local tampering. Multiple Windows versions and server releases are affected, including Windows 10, Windows 11, and Windows Server. The vulnerability has a medium severity and requires local access for exploitation. Defenders should assess exposure and prioritize patching for affected systems. The CVE record and source item provide details on the vulnerability and affected systems, but there is limited information on exploitation or impact.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows systems, especially those with local access, should assess exposure and prioritize patching. This includes administrators, security teams, and vulnerability management teams. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. Additionally, they should plan vendor-supported updates or mitigations through normal (

Why it matters

CVE-2026-96311 is a medium-severity vulnerability in Windows Network List Service, allowing local tampering by authorized attackers. Defenders should prioritize patching and monitoring for affected systems.

  • Local tampering attempts may occur, requiring monitoring and incident response readiness
  • Patching is necessary to prevent exploitation
  • System inventory and vulnerability management are crucial for affected systems

Technical summary

The Windows Network List Service has an improper authorization vulnerability, allowing an authorized attacker to perform local tampering. Affected systems include Windows 10 versions 1607, 1809, 21H2, 22H2, Windows 11 versions 23H2, 24H2, 25H2, 26H1, 26H2, and various Windows Server releases.

Defensive priority

Defenders should prioritize patching affected systems, especially those exposed to local attacks.

Recommended defensive actions

  • Patch affected Windows 10, Windows 11, and Windows Server systems
  • Verify system exposure and prioritize patching for systems with local access
  • Monitor for potential tampering attempts

Evidence notes

The CVE record and source item provide details on the vulnerability and affected systems. However, there is limited information on exploitation or impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-96311 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-96311

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

  • CVE-2026-96311 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-96311

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

Supplemental references

  • Windows Network List Service Tampering Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/96xxx/CVE-2026-96311.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96311

    Supplemental source - vendor-advisory, patch

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.