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CVE-2026-32091 Microsoft CVE debrief

Microsoft Brokering File System Elevation of Privilege Vulnerability allows unauthorized local privilege escalation through a race condition. Multiple Windows versions are affected, including Windows 10, Windows 11, and Windows Server. This vulnerability, known as CVE-2026-32091, has a high CVSS score of 8.4, indicating a high severity level. The vulnerability exists in the Microsoft Brokering File System, which is a critical component of Windows operating systems. An attacker can exploit this vulnerability to elevate privileges locally, potentially leading to significant damage. Defenders should prioritize patching and verifying system exposure to prevent potential exploitation. A

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders responsible for Windows systems, especially those with high-risk exposure, should prioritize patching and verifying system exposure.

Why it matters

CVE-2026-32091 is a high-severity elevation of privilege vulnerability in Microsoft Brokering File System. Defenders should prioritize patching and verifying system exposure to prevent potential exploitation.

  • Verify patch deployment and system exposure to prevent potential exploitation
  • Prioritize patching for high-risk systems, such as those with elevated privileges or sensitive data
  • Monitor for potential exploitation attempts and adjust defensive measures accordingly

Technical summary

The Microsoft Brokering File System Elevation of Privilege Vulnerability (CVE-2026-32091) is a race condition vulnerability that allows unauthorized local privilege escalation. The vulnerability affects multiple Windows versions, including Windows 10, Windows 11, and Windows Server. Microsoft has released a patch for the vulnerability.

Defensive priority

Defenders should prioritize patching and verifying system exposure, especially for high-risk systems.

Recommended defensive actions

  • Patch affected Windows systems
  • Verify system exposure and prioritize high-risk systems
  • Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and affected systems. Microsoft has a patch available for the vulnerability. The vulnerability affects multiple Windows versions, including Windows 10, Windows 11, and Windows Server. The CVE record was published on 2026-04-14T16:58:24.748Z and has not been modified since then. There is no evidence of exploitation in the wild, but defenders should still prioritize patching and verifying system exposure. The official CVE

Sources and references

Verified primary and authoritative sources

  • CVE-2026-32091 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-32091

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

  • CVE-2026-32091 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-32091

    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.