What is CORS and how to use it correctly in a web application?

The article on Sekurak.pl provides an in-depth explanation of CORS (Cross-Origin Resource Sharing) and its significance for the security of web applications. CORS is a mechanism that allows servers to control which resources can be shared across different domains. Every developer should be aware of this topic, as misconfigurations in CORS can lead to serious security issues. For example, overly permissive CORS policies can open avenues for CSRF attacks, where malicious sites can access user data. The article also discusses best practices and tools that can assist in testing and verifying CORS settings. Understanding CORS is crucial for ensuring a high level of application security, especially in an age of increasing threats on the internet.