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CVE-2026-50439 Microsoft CVE debrief

CVE-2026-50439 is a high-severity vulnerability in Microsoft Message Queuing Queue Manager. The vulnerability is caused by a use-after-free issue, which allows an unauthorized attacker to execute code over a network. The CVSS score for this vulnerability is 8.1. This vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server. Users of these systems should apply the patch provided by Microsoft to mitigate the vulnerability. The vulnerability has a high impact on the system and requires immediate attention.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.1
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

This vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server. Users of these systems should apply the patch provided by Microsoft to mitigate the vulnerability. The vulnerability has a high impact on the system and requires immediate attention from system administrators and security teams.

Technical summary

The vulnerability is caused by a use-after-free issue in Microsoft Message Queuing Queue Manager. This allows an unauthorized attacker to execute code over a network. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server.

Defensive priority

High

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Ensure that Windows 10, Windows 11, and Windows Server systems are up-to-date
  • Monitor systems for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:17:48.123Z and was last modified on 2026-07-21T04:17:36.813Z. The NVD entry is currently Analyzed. This vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server. Users of these systems should apply the patch provided by Microsoft to mitigate the vulnerability. The CVSS score for this vulnerability is 8.1, indicating a high severity. The vulnerability is caused by a use-after-free issue in Microsoft Message Queuing Queue Manager, which allows an unauthorized attacker to execute code over a network.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50439 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50439

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

  • CVE-2026-50439 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50439

    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.