It is a string of letters and numbers used to verify, track, and store information about a user on a Web site, such as saving user preferences. The string is created by the server that passes it to a browser that stores it in the computer memory.
This file is often used as a target for attacks, as a target for impersonation / theft of private information.
Session/ Authentication cookies
Authentication cookies are the most common method used by web servers to know whether the user is logged in or not, and which account they are logged in with. Without such a mechanism, the site would not know whether to send a page containing sensitive information, or require the user to authenticate themselves by logging in. The security of an authentication cookie generally depends on the security of the issuing website and the user’s web browser, and on whether the cookie data is encrypted. Security vulnerabilities may allow a cookie’s data to be read by a hacker, used to gain access to user data, or used to gain access (with the user’s credentials) to the website to which the cookie belongs.
Example:
Colorpost.php
Colorget.php
And then you can guess values (pages / actions) that are not visible and that might have been trying to hide from us.
Example:
black.php
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