Automatically Login to Embedded Content using Cookies?

If a visitor is already logged into my site and visits a site which has embedded content from my site on the same browser, could the embed section hosted on the other site automatically log them into the embed section by having code to retrieve the cookies from my site? If so, can this be done securely so that the cookies do not pass through the site which is hosting the embed section, and rather the embed section would directly retrieve the cookies from my server?

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