So the bank recognizes you and actually performs the payment. The browser sends cookies every time you visit the site, even if the form was submitted from. That site has JavaScript code that submits a form to with fields that initiate a transaction to the hacker’s account. Now, while browsing the web in another window, you accidentally come to another site. Your browser sends it to with every request, so that it recognizes you and performs all sensitive financial operations. That is: you have an authentication cookie from that site. To understand how it works and when it’s useful, let’s take a look at XSRF attacks. It’s designed to protect from so-called XSRF (cross-site request forgery) attacks. That’s another security attribute samesite. set the cookie to be secure (only accessible over HTTPS)ĭokie = "user=John secure" samesite For instance, we can set the cookie to expire in 1 day: ![]() The date must be exactly in this format, in the GMT timezone. The cookie expiration date defines the time, when the browser will automatically delete it. To let cookies survive a browser close, we can set either the expires or max-age option. Such cookies are called “session cookies” expires, max-ageīy default, if a cookie doesn’t have one of these options, it disappears when the browser is closed. To summarize, the domain option allows to make a cookie accessible at subdomains. That’s an old notation and should be used if we need to support very old browsers. make the cookie accessible on any subdomain *.:ĭokie = "user=John domain="Īlert(okie) // has cookie user=Johnįor historical reasons, domain=. (with a dot before ) also works the same way, allowing access to the cookie from subdomains. Please note, by default a cookie is also not shared to a subdomain as well, such as. ![]() It’s a safety restriction, to allow us to store sensitive data in cookies that should be available only on one site.īy default, a cookie is accessible only at the domain that set it. ![]() There’s no way to let a cookie be accessible from another 2nd-level domain, so will never receive a cookie set at. In practice though, there are limitations. domainĪ domain defines where the cookie is accessible. Usually, we should set path to the root: path=/ to make the cookie accessible from all website pages. If a cookie is set with path=/admin, it’s visible at pages /admin and /admin/something, but not at /home or /adminpage. It makes the cookie accessible for pages under that path. okie = "user=John path=/ expires=Tue, 03:14:07 GMT" path
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