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CVE-2026-50427 Microsoft CVE debrief

CVE-2026-50427 is a high-severity vulnerability in Microsoft's Content Delivery Manager, allowing 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 users are advised to apply it as soon as possible. The vulnerability is a use-after-free issue in the Content Delivery Manager, which can be exploited by an authorized attacker to gain elevated privileges. The affected products include Microsoft Windows 10, Windows 11, and Windows Server systems. The NVD entry provides additional details on the vulnerability, including its CVSS vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-21
Advisory published
2026-07-14
Advisory updated
2026-07-21

Who should care

Administrators and users of Microsoft Windows 10, Windows 11, and Windows Server systems should be aware of this vulnerability and take necessary precautions to protect their systems. This includes applying the patch released by Microsoft, monitoring systems for suspicious activity, and implementing additional security measures such as multi-factor authentication and least privilege access. IT teams and security professionals should prioritize patching and verifying the integrity of their systems to prevent potential exploitation.

Technical summary

The vulnerability is a use-after-free issue in the Content Delivery Manager, which allows an authorized attacker to elevate privileges locally. The vulnerability has been analyzed by the NVD and has a CVSS vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The affected products include Microsoft Windows 10, Windows 11, and Windows Server systems. The vulnerability can be exploited by an authorized attacker to gain elevated privileges, potentially leading to unauthorized access and malicious activity.

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 2026-07-14T18:17:46.283Z and was last modified on 2026-07-21T03:56:35.703Z. The NVD entry is currently Analyzed. The vulnerability has been identified in Microsoft's Content Delivery Manager, which is a critical component for managing content delivery. The evidence gathered so far indicates that an authorized attacker can exploit this vulnerability to elevate privileges locally. Further verification is required to determine the full scope of affected systems and potential mitigations.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T18:17:46.283Z and has not been modified since then. The NVD entry is currently Analyzed.