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PatchSiren cyber security CVE debrief

CVE-2026-85867 Microsoft CVE debrief

A heap-based buffer overflow vulnerability exists in the Windows Remote Access Connection Manager, allowing an authorized attacker to elevate privileges locally. Multiple Windows versions and editions are affected, including Windows 10, Windows 11, and Windows Server. The vulnerability is caused by improper handling of input data, leading to a potential elevation of privilege. System administrators should assess exposure and apply patches immediately. The CVE Program and NVD provide official records of the vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
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

System administrators, security teams, and IT professionals responsible for Windows systems and networks should assess exposure and apply patches.

Why it matters

CVE-2026-85867 is a high-severity elevation of privilege vulnerability in Windows Remote Access Connection Manager. Defenders should prioritize patching affected systems to prevent potential local privilege escalation by authorized attackers.

  • Potential local privilege escalation
  • Increased risk for authorized attackers
  • Necessity for immediate patching
  • Potential impact on system security

Technical summary

The vulnerability is caused by a heap-based buffer overflow in the Windows Remote Access Connection Manager. An authorized attacker can exploit this vulnerability to elevate privileges locally by sending specially crafted input data. The vulnerability affects multiple Windows versions and editions, including Windows 10, Windows 11, and Windows Server. Microsoft has released a patch for the issue, and defenders should prioritize patching affected systems to prevent potential exploitation.

Defensive priority

Apply patches immediately for affected Windows versions, especially on systems with Remote Access Connection Manager exposed or used.

Recommended defensive actions

  • Apply patches for affected Windows versions
  • Review and update vulnerability management processes
  • Monitor systems for potential exploitation attempts

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the issue. The vulnerability is tracked as CVE-2026-85867 and has been assigned a high severity score. The patch is available through the Microsoft security update guide. Defenders should verify affected systems and apply patches to prevent potential exploitation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85867 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85867

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

  • CVE-2026-85867 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85867

    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.