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CVE-2026-50365 Microsoft CVE debrief

CVE-2026-50365 is a HIGH severity vulnerability with a CVSS score of 8. The vulnerability is caused by improper authentication in the Windows RPC API, which allows an unauthorized attacker to elevate privileges over an adjacent network. This vulnerability affects Windows systems, particularly those with exposure to adjacent networks. System administrators and security teams should be aware of this vulnerability and take necessary actions to mitigate it.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-23
Advisory published
2026-07-14
Advisory updated
2026-07-23

Who should care

System administrators and security teams responsible for Windows systems, particularly those with exposure to adjacent networks, should be aware of this vulnerability and take necessary actions to mitigate it. This includes reviewing system configurations, monitoring for suspicious activity, and implementing compensating controls.

Technical summary

The vulnerability exists in the Windows RPC API, which is used for remote procedure calls. An unauthorized attacker can exploit this vulnerability to elevate privileges over an adjacent network. The CVSS vector for this vulnerability is CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Affected product context indicates Windows systems are impacted.

Defensive priority

High priority should be given to patching affected systems, especially those exposed to adjacent networks. Additionally, implement compensating controls and monitor for suspicious activity.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Conduct a thorough inventory of Windows systems and their exposure to adjacent networks
  • Implement compensating controls, such as network segmentation and access controls
  • Monitor for suspicious activity and implement exception tracking
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:17:37.010Z and was last modified on 2026-07-20T15:05:23.653Z. The NVD entry is currently Analyzed. The vulnerability is caused by improper authentication in the Windows RPC API, which allows an unauthorized attacker to elevate privileges over an adjacent network. Evidence is limited to CVE and NVD details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50365 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50365

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

  • CVE-2026-50365 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50365

    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.