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CVE-2026-50455 Microsoft CVE debrief

CVE-2026-50455 is a medium-severity vulnerability in the Universal Plug and Play (upnp) component. An authorized attacker can exploit this vulnerability locally to disclose information. The vulnerability has a CVSS score of 5.5. The upnp component is used for discovering and controlling network devices. This vulnerability could potentially allow attackers with local access to gain unauthorized information about the system. System administrators should review the vulnerability details and consider applying patches or mitigations.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
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

System administrators and security teams responsible for managing and securing Windows systems, particularly those using Universal Plug and Play (upnp), should be aware of this vulnerability. These teams should assess their system's exposure and consider applying patches or mitigations. Additionally, security teams should monitor system logs for suspicious activity related to upnp.

Technical summary

The vulnerability is caused by the use of an uninitialized resource in the Universal Plug and Play (upnp) component. This allows an authorized attacker to disclose information locally. The vulnerability has been analyzed and has a CVSS vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. The upnp component is a part of Windows systems and is used for device discovery and control. The vulnerability does not require remote access, making it a local exploitation risk.

Defensive priority

Medium priority should be given to patching and mitigating this vulnerability, as it can be exploited locally by an authorized attacker. However, given the local exploitation requirement, the priority may be adjusted based on the specific security posture and risk assessment of the organization.

Recommended defensive actions

  • Apply the available patch from Microsoft
  • Review and update access controls for the upnp component
  • Monitor system logs for suspicious activity
  • Consider implementing compensating controls, such as network segmentation
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:17:50.423Z and was last modified on 2026-07-21T16:51:00.030Z. The NVD entry is currently Analyzed. The vulnerability has been identified in the Universal Plug and Play (upnp) component. Evidence of exploitation has not been reported. However, defenders should verify system logs for suspicious activity related to upnp. Additional information from other sources may be limited, and further verification is recommended.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T18:17:50.423Z and has not been modified since then. The NVD entry is currently Analyzed.