Microsoft WinJS winjsdevelop Uncontrolled Search Path Element Remote Code Execution Vulnerability

June 25th, 2025
ZDI-25-423 ZDI-CAN-23719

CVE ID

CVSS Score

9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Microsoft

Affected Products

WinJS

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft WinJS. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the installation of WinJS. When installed from the official Microsoft NPM repository, the installation attempts to load a non-existent cloud resource that is vulnerable to takeover. An attacker can leverage this vulnerability to execute code on systems dependent on the cloud resource.

Additional Details

Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/acknowledgement/online

Disclosure Timeline

  • 2024-03-14 - Vulnerability reported to vendor
  • 2025-06-25 - Coordinated public release of advisory
  • 2025-06-25 - Advisory Updated

Credit

Nitesh Surana (@_niteshsurana) of Trend Micro Research

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