Answer:
No, hackers can steal information from cookies. This many times depend on the type of cookies.
Cookies, by general definition, are programs embedded onto browsers which collect non-invasive information about our activities such so that it can adapt to our needs.
The type of information that a cookie collects depends on what type of cookie it is.
Session Cookies: These types of cookies only collect information about the movement of the user on the website such as pages visited, products that were examined (for e-commerce websites) and products/services that the user put in their cart.
These type of cookies are temporary and are deleted as soon as the browser is shut down.
Persistent Cookies:
These do the same thing that the Session cookies do only that they are more permanent and are stored in a text file even after the browser and the computer has been shut down.
It is these types of cookies that pose a threat. These type of cookies many store codes and passwords and log-in details which may be exploited by a hacker.
Cheers!