Cors - Unblock

You install “CORS Unblock” extension, then visit evil-news.com . That site’s script can now fetch("https://your-company-slack.com/api/messages") and read your private Slack DMs.

Cross-Origin Resource Sharing (CORS) is a browser security mechanism that restricts web pages from making requests to a different domain than the one serving the web page. This policy is essential for preventing malicious websites from accessing sensitive data on other sites (e.g., preventing a malicious site from reading your email on a different tab).

is a security mechanism implemented by web browsers to prevent a malicious site from reading sensitive data from another site. By default, browsers block requests made from one domain (origin) to another unless the receiving server explicitly permits it. When a request is blocked, developers encounter the dreaded "CORS error." Popular Ways to "CORS Unblock" Your Browser