SameSitemerkintöjä

SameSitemerkintöjä, often translated as "SameSite cookies," refers to a security feature implemented in web browsers to mitigate the risk of Cross-Site Request Forgery (CSRF) attacks. It controls when cookies are sent with cross-site requests. This mechanism helps prevent malicious websites from tricking a user's browser into performing unwanted actions on another website where the user is authenticated.

There are three main attributes for SameSite cookies: Strict, Lax, and None. The Strict attribute is the most restrictive; it ensures that cookies are only sent with requests originating from the exact same site. The Lax attribute, which is the default in many modern browsers, allows cookies to be sent with top-level navigations (like clicking a link) and same-site requests, but not with cross-site requests initiated by scripts or image embeds. The None attribute, introduced to allow cookies to be sent with all cross-site requests, requires the Secure attribute to also be present, meaning the cookie will only be sent over HTTPS.

The implementation of SameSite cookies aims to enhance user privacy and security by adding a layer of defense against common web vulnerabilities. Developers must configure their cookies appropriately to ensure correct behavior across different browsers and to maintain the desired level of security for their web applications. Incorrectly configured SameSite attributes can lead to issues with website functionality, especially for features that rely on cross-site cookie access.