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PatchSiren cyber security CVE debrief

CVE-2026-56187 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T18:18:28.650Z and has not been modified since then. This use-after-free vulnerability in the Windows MIDI Service Module allows an authorized attacker to elevate privileges locally. System administrators and users of Windows 11 24H2, Windows 11 25H2, and Windows 11 26H1 should apply patches to prevent local privilege escalation attacks. The vulnerability has a CVSS score of 7 and a severity rating of HIGH.

Vendor
Microsoft
Product
Windows 11 Version 24H2
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-23
Advisory published
2026-07-14
Advisory updated
2026-07-23

Who should care

System administrators and users of Windows 11 24H2, Windows 11 25H2, and Windows 11 26H1 should apply patches to prevent local privilege escalation attacks. This vulnerability has a high impact on Windows systems and requires immediate attention.

Technical summary

CVE-2026-56187 is a use-after-free vulnerability in the Windows MIDI Service Module. An authorized attacker can exploit this vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 7 and a severity rating of HIGH. This vulnerability affects Windows 11 24H2, Windows 11 25H2, and Windows 11 26H1. Microsoft has provided a patch for this vulnerability.

Defensive priority

High priority due to local privilege escalation risk. Apply patches provided by Microsoft and ensure Windows 11 systems are up-to-date.

Recommended defensive actions

  • Apply patches provided by Microsoft
  • Ensure Windows 11 systems are up-to-date
  • Monitor system logs for suspicious activity
  • Implement least privilege access controls
  • Conduct regular vulnerability assessments

Evidence notes

The CVE record and NVD details indicate a use-after-free vulnerability in Windows MIDI Service Module. Microsoft has provided a patch for this vulnerability. The vulnerability allows an authorized attacker to elevate privileges locally. The CVE record was published on 2026-07-14T18:18:28.650Z and has not been modified since then. There are no known ransomware campaigns using this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56187 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56187

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

  • CVE-2026-56187 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56187

    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.