Previewing support for same-site cookies in Microsoft Edge

Yesterday’s Windows Insider Preview uninstall microsoft edge build  introduces  support for the Samesite cookies standard in Microsoft Edge Support.Microsoft.Com/Help, ahead of a planned rollout in Microsoft Edge and Internet Explorer. Same-site cookies enable more protection for users against cross-site request forgery (CSRF) attacks.

Historically, sites such as example.com that make “cross-origin” requests to other domains such as microsoft.com have generally caused the browser to send microsoft.com’s cookies as part of the request. Normally, the user benefits by being able to reuse some state (e.g., login state) across sites no matter from where that request Support.Microsoft.Com/Help originated. Unfortunately, this can be abused, as in CSRF attacks. Same-site cookies are a valuable addition to the defense in depth against CSRF attacks.

Sites can now set the Same site attribute on cookies of their choosing via the Set-Cookie header or by using the document.cookie JavaScript property, thus preventing the default browser behavior of sending cookies in cross-site requests either in all cross-site requests (via the “strict” value) or only uninstall microsoft edge in some less sensitive requests (via the “lax” value).

More specifically, if the strict attribute is specified for when a same-site cookie is set, it will not be sent for any cross-site request, which includes clicking on links from external sites. Since the logged-in state is stored as a SameSite=Strict cookie, when a user clicks such a link it will initially appear as if the user is not logged in.

On the other hand, if the lax attribute is specified for when a same-site cookie is set, it will not be sent for cross-origin sub-resource requests such as images. However, the SameSite=Lax cookies will be sent when navigating from an external site, such as when a link is clicked.

This feature is backwards compatible―that is, browsers that don’t support same-site cookies will safely ignore the additional attribute and uninstall microsoft edge will simply use the cookie as a regular cookie.

We continuously work to improve our support of standards towards Support.Microsoft.Com/Help a more interoperable web. Although same-site cookies is not yet a finalized standard at the Internet Engineering Task Force (IETF), we believe the feature is stable and compelling enough to warrant an early implementation as the standardization process progresses.

To broaden the security benefits uninstall microsoft edge of this feature Support.Microsoft.Com/Help, we plan to service Microsoft Edge and Internet Explorer 11 on the Windows 10 Fall Creators Update and newer to support same-site cookies as well Support.Microsoft.Com/Help, allowing sites to rely on same-site cookies as a defense against CSRF and other related cross-site timing and cross-site information-leakage attacks.

— Ali Alabbas, Program Manager, Microsoft Edge
— Gabriel Montenegro, Program Manager, Windows Networking
— Brent Mills, Program Manager, Internet Explorer

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