Path traversal is a vulnerability that allows an attacker to read arbitrary files and directories that are stored outside of the intended files to distribute. This might include sensitive files like secrets, configuration files as well as sensitive operating system files (like /etc/passwd). 
The OpenShift Console has an endpoint for plugins to serve resources in multiple languages: /locales/resources.json The lng and ns parameters for this endpoint are used to unsafely construct a filepath in pkg/plugins/handlers.go#L112 Because of this unsafe filepath construction, an authenticated user can manipulate the path to retrieve any JSON files on the console's pod by using sequences of ../ and valid directory paths.

Impact:
Because of the affected endpoint's logic, only files with the .json extension can be accessed, limiting greatly the impact of this vulnerability. No security-impactful JSON files could be identified on the console's pod.