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Let's Encrypt is a free, automated, and open certificate authority brought to you by the nonprofit Internet Security Research Group (ISRG). Read all about our nonprofit work this year in our 2023 Annual Report.

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  • pcouy@lemmy.pierre-couy.frOPEnglish
    2·
    4 hours ago

    Having a certificate for any subdomain has implications for other sibling domains, even without a wildcard certificate.

    By default, web browsers are a lot less strict about Same Origin Policy for sibling domains, which enables a lot of web-based attacks (like CSRF and cookie stealing) if your able to hijack any subdomain