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CVE-2026-50323 Microsoft CVE debrief

CVE-2026-50323 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. This vulnerability is a use-after-free issue in Windows Runtime. 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 multiple versions of Windows 11 and Windows Server 2025. System administrators and users of Windows 11 and Windows Server 2025 should be aware of this vulnerability and take necessary precautions to protect their systems. The CVE record was published on 2026-07-14T17:16:59.573Z and has not been modified since then. Microsoft has released a patch for this vulnerability, which is available on their website.

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 necessary precautions to protect their systems.

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 multiple versions of Windows 11 and Windows Server 2025.

Defensive priority

High

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Ensure that all systems are up-to-date with the latest security patches
  • Monitor systems for any suspicious activity
  • Implement additional security measures such as multi-factor authentication and least privilege access

Evidence notes

The vulnerability is documented in the CVE record and the NVD detail page. Microsoft has released a patch for this vulnerability, which is available on their website. The patch is currently available for download and installation. Users are advised to apply the patch as soon as possible to prevent exploitation of the vulnerability. Additional information can be found on the Microsoft website. The CVE record was published on 2026-07-14T17:16:59.573Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50323 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50323

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

  • CVE-2026-50323 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50323

    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.