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CVE-2026-50393 Microsoft CVE debrief

CVE-2026-50393 is a high-severity vulnerability in Windows Kernel-Mode Drivers. An authorized attacker can exploit this use-after-free vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. Microsoft has released a patch for this vulnerability. System administrators and users of Windows 11 and Windows Server 2025 should be aware of this vulnerability and take steps to mitigate it. The vulnerability exists in the Windows Kernel-Mode Drivers and is caused by a use-after-free error. Limited information is available about potential workarounds or mitigations.

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
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

System administrators and users of Windows 11 and Windows Server 2025 should be aware of this vulnerability and take steps to mitigate it. This includes applying the patch released by Microsoft and monitoring systems for suspicious activity. Additionally, implementing compensating controls to prevent exploitation may be necessary. It is also recommended to review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The vulnerability exists in the Windows Kernel-Mode Drivers and is caused by a use-after-free error. An authorized attacker can exploit this vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. Microsoft has released a patch for this vulnerability. However, details about the patch and potential workarounds are limited. Further verification is needed to understand the full scope of the vulnerability and potential mitigations.

Defensive priority

High

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Ensure that all Windows 11 and Windows Server 2025 systems are updated with the latest security patches
  • Monitor systems for suspicious activity
  • Implement compensating controls to prevent exploitation
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record was published on 2026-07-14T18:17:41.440Z and was last modified on 2026-07-21T12:52:58.173Z. The NVD entry is currently Analyzed. The vulnerability exists in Windows Kernel-Mode Drivers and is caused by a use-after-free error. Microsoft has released a patch for this vulnerability. However, details about the patch and potential workarounds are limited. Further verification is needed to understand the full scope of the vulnerability and potential mitigations.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50393 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50393

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

  • CVE-2026-50393 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50393

    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.