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CVE-2026-50449 Microsoft CVE debrief

CVE-2026-50449 is a high-severity vulnerability in Windows Runtime that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and is classified as HIGH. Microsoft has released a patch for this vulnerability, and users are advised to apply it as soon as possible. The vulnerability is a use-after-free issue in Windows Runtime that allows an authorized attacker to elevate privileges locally. System administrators and users of Windows 10, Windows 11, and Windows Server are advised to take action to mitigate this vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1809
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 10, Windows 11, and Windows Server are advised to take action to mitigate this vulnerability. The vulnerability has a CVSS score of 7 and is classified as HIGH. Microsoft has released a patch for this vulnerability, and users are advised to apply it as soon as possible.

Technical summary

The vulnerability is a use-after-free issue in Windows Runtime that allows an authorized attacker to elevate privileges locally. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H. The vulnerability affects Windows 10, Windows 11, and Windows Server. Microsoft has released a patch for this vulnerability, and users are advised to apply it as soon as possible.

Defensive priority

High

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Ensure that all Windows systems are up-to-date with the latest security patches
  • Monitor systems for suspicious activity
  • Implement additional security measures such as multi-factor authentication and least privilege access
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record was published on 2026-07-14T18:17:49.477Z and was last modified on 2026-07-21T16:49:59.823Z. The NVD entry is currently Analyzed. The vulnerability has a CVSS score of 7 and is classified as HIGH. Microsoft has released a patch for this vulnerability, and users are advised to apply it as soon as possible. The evidence is limited, and defenders should verify the affected scope and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50449 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50449

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

  • CVE-2026-50449 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50449

    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.