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CVE-2026-87712 Microsoft CVE debrief

Microsoft Windows QoS Scheduler Driver Elevation of Privilege Vulnerability is a high-severity vulnerability that allows an authorized attacker to elevate privileges locally. The vulnerability exists in the Windows Quality of Service (QoS) Packet Scheduler. Defenders responsible for Windows 10, Windows 11, and Windows Server systems should assess exposure and apply patches. The vulnerability has a CVSS score of 7.8 and is considered HIGH severity. The CVE record and source item provide details on the vulnerability, but limited information is available on exploitation or impact.

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

Defenders responsible for Windows 10, Windows 11, and Windows Server systems should assess exposure and apply patches. System administrators and security teams should verify system versions and apply patches from Microsoft. Monitoring for local privilege elevation attempts is also recommended. This vulnerability may impact organizations that use Windows 10, Windows 11, and Windows Server systems.

Why it matters

CVE-2026-87712 is a high-severity elevation of privilege vulnerability in the Windows QoS Scheduler Driver. Defenders should assess exposure for Windows 10, Windows 11, and Windows Server systems, verify system versions, and apply patches from Microsoft. Monitoring for local privilege elevation attempts is also recommended.

  • Local privilege elevation is possible
  • Patching is required to mitigate the vulnerability
  • System version verification is necessary

Technical summary

A use-after-free vulnerability in the Windows Quality of Service (QoS) Packet Scheduler allows an authorized attacker to elevate privileges locally. The vulnerability exists in the Windows QoS Scheduler Driver. The CVE record and source item provide details on the vulnerability, but limited information is available on exploitation or impact. The vulnerability has a CVSS score of 7.8 and is considered HIGH severity.

Defensive priority

High

Recommended defensive actions

  • Assess exposure for Windows 10, Windows 11, and Windows Server systems
  • Verify system versions and apply patches from Microsoft
  • Monitor for local privilege elevation attempts

Evidence notes

The CVE record and source item provide details on the vulnerability, but limited information is available on exploitation or impact. The vulnerability has a CVSS score of 7.8 and is considered HIGH severity. There is no information on known or unknown affected scope. Defenders should verify system versions and apply patches from Microsoft. Monitoring for local privilege elevation attempts is also recommended.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-87712 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-87712

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

  • CVE-2026-87712 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-87712

    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.