Cross-Origin Resource Sharing (CORS) is a mechanism that uses additional HTTP header to let the browser know that an application is running from one domain (Origin) and has permission to access resources from another origin (Server). The Cross-Origin Resource Sharing is not found in many of the servers. This vulnerability enables the web browser to perform cross-domain request using XMLHTTPRequest L2 API. There are many servers implemented with weak Cross-Origin Resource Sharing policy. The Cross-Origin Resource Sharing or CORS is a mechanism that enables a web browser to perform “cross-domain” requests using the XMLHttpRequest L2 API in a controlled manner. The content is visible via cross-origin resource sharing (CORS) files or headers this can lead to access to sensitive data.
Consider a frontend script code for a web application served from http://example.beaglesecurity.com uses XMLHttpRequest to make a request for http://api.example.beaglesecurity.com/data.json.
The major impact includes code injection attacks. Code injection is the exploitation of a computer bug which includes processing invalid data.
This vulnerability can be fixed:-