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CVE-2026-62722 Microsoft CVE debrief

Microsoft has addressed an elevation of privilege vulnerability in the Windows Brokering File System. The vulnerability, tracked as CVE-2026-62722, is a heap-based buffer overflow that allows an authorized attacker to elevate privileges locally. The vulnerability affects multiple versions of Windows 11 and Windows Server 2025. Defenders should assess exposure and prioritize patching. The CVE Program and NVD have provided information on this vulnerability. Microsoft has also provided a patch for the vulnerability.

Vendor
Microsoft
Product
Windows 11
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-10-08
Advisory published
2026-08-11
Advisory updated
2026-10-08

Who should care

Defenders responsible for Windows 11 and Windows Server 2025 systems should assess exposure and prioritize patching. The vulnerability affects multiple versions of Windows 11 and Windows Server 2025. Defenders should review system configurations and ensure that the Windows Brokering File System is properly configured.

Why it matters

CVE-2026-62722 is a heap-based buffer overflow vulnerability in the Windows Brokering File System that allows an authorized attacker to elevate privileges locally. Defenders should prioritize patching this vulnerability to prevent potential elevation of privileges on affected systems.

  • Potential elevation of privileges on affected systems
  • Possible increased risk of lateral movement within a network

Technical summary

The vulnerability is a heap-based buffer overflow in the Windows Brokering File System that allows an authorized attacker to elevate privileges locally. The vulnerability affects multiple versions of Windows 11 and Windows Server 2025. Defenders should assess exposure and prioritize patching. The CVE Program and NVD have provided information on this vulnerability. Microsoft has also provided a patch for the vulnerability.

Defensive priority

Defenders should prioritize patching this vulnerability, as it could allow an attacker to gain elevated privileges on a system.

Recommended defensive actions

  • Apply patches from Microsoft
  • Review system configurations and ensure that the Windows Brokering File System is properly configured
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE Program and NVD have provided information on this vulnerability. Microsoft has also provided a patch for the vulnerability. The vulnerability affects multiple versions of Windows 11 and Windows Server 2025. Defenders should assess exposure and prioritize patching. The vulnerability is a heap-based buffer overflow in the Windows Brokering File System that allows an authorized attacker to elevate privileges locally.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62722 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62722

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

  • CVE-2026-62722 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62722

    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.