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PatchSiren cyber security CVE debrief

CVE-2026-85357 Microsoft CVE debrief

A race condition vulnerability exists in Windows Phone Service, allowing an authorized attacker to elevate privileges locally. This issue affects multiple versions of Windows 11 and Windows Server. Microsoft has released patches for this vulnerability. Windows administrators and security teams should assess exposure, especially for systems with high privilege escalation risk, and apply patches immediately. The vulnerability has a high severity score and requires immediate attention to prevent potential unauthorized access and lateral movement.

Vendor
Microsoft
Product
Windows 11 version 23H2
CVSS
HIGH 7
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

Windows administrators and security teams should assess exposure and apply patches for CVE-2026-85357, especially for systems with high privilege escalation risk.

Why it matters

CVE-2026-85357 is a high-severity vulnerability in Windows Phone Service that allows local privilege escalation. Windows administrators and security teams should assess exposure, especially for systems with high privilege escalation risk, and apply patches immediately.

  • Local privilege escalation risk for Windows systems
  • Potential for unauthorized access and lateral movement
  • Need for patching and inventory management

Technical summary

A race condition vulnerability exists in Windows Phone Service, allowing an authorized attacker to elevate privileges locally. The vulnerability affects multiple versions of Windows 11 and Windows Server 2022. Microsoft has released patches for this issue.

Defensive priority

Apply patches for CVE-2026-85357 immediately, especially for systems with high privilege escalation risk.

Recommended defensive actions

  • Apply patches for CVE-2026-85357
  • Inventory Windows 11 and Windows Server systems for exposure
  • Verify privilege escalation risk for affected systems

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a vendor advisory with patch information. The vulnerability affects multiple Windows 11 and Windows Server versions. There is no indication of public exploitation, but defenders should verify patch applicability and system exposure. Official CVE and NVD records provide additional context and details about the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85357 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85357

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

  • CVE-2026-85357 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85357

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

Supplemental references

  • Windows Phone Service Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/85xxx/CVE-2026-85357.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85357

    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.