CSRF (Cross-Site Request Forgery) is an attack that impersonates a trusted user and sends a website unwanted commands.
This can be done, for example, by including malicious parameters in a URL behind a link that purports to go somewhere else:
<img src="https://www.example.com/index.php?action=delete&id=123" />
For users who have modification permissions on
<img> element executes action on
https://www.example.com without their noticing, even if the element is not at
There are many ways to prevent CSRF, such as implementing RESTful API, adding secure tokens, etc.