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CVE-2026-56172 Microsoft CVE debrief

CVE-2026-56172 is a high-severity vulnerability in the Windows VHD miniport driver that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH. Microsoft has released a patch for this vulnerability, and defenders should prioritize patching to prevent potential attacks. The vulnerability is a use-after-free issue that can be exploited by an authorized attacker to gain elevated privileges. Defenders should review system logs for potential attacks and monitor system activity for suspicious behavior.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-17
Advisory published
2026-09-08
Advisory updated
2026-09-17

Who should care

Defenders responsible for patching and securing Windows systems, particularly those managing systems that use the Windows VHD miniport driver, should prioritize this vulnerability. This includes operators, platform administrators, and security teams who need to ensure that systems are patched and up-to-date to prevent potential attacks.

Why it matters

CVE-2026-56172 is a high-severity vulnerability in the Windows VHD miniport driver that allows an authorized attacker to elevate privileges locally. Defenders should prioritize patching to prevent potential attacks.

  • Elevation of privileges by authorized attackers
  • Potential for lateral movement within compromised systems

Technical summary

The vulnerability is a use-after-free issue in the Windows VHD miniport driver that allows an authorized attacker to elevate privileges locally. The CVE record and NVD entry provide details on the vulnerability, including affected systems and potential impacts.

Defensive priority

Patching vulnerable systems is a high priority to prevent potential attacks.

Recommended defensive actions

  • Patch vulnerable systems
  • Review system logs for potential attacks
  • Monitor system activity for suspicious behavior

Evidence notes

The vulnerability is described as a use-after-free issue in the Windows VHD miniport driver. The CVE record and NVD entry provide details on the vulnerability, but there is limited information on potential attacks or exploits.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56172 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56172

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

  • CVE-2026-56172 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56172

    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.