Cross-Origin Resource Sharing (CORS) is a mechanism that uses additional HyperText Transfer Protocol (HTTP) header. This header will let the browser know that an application is running from one domain (Origin) and has permission to access resources from another origin (Server). This application is using Cross-Origin Resource Sharing in an insecure way. If this header is not properly configured, any website can issue requests made with user credentials and can read the responses to these requests.
The major impact includes code injection attacks. Code injection is the exploitation of a computer bug which includes processing invalid data.
Beagle recommends the following:-