Happy birthday to Let's Encrypt !
Huge thanks to everyone involved in making HTTPS available to everyone for free !
this post was submitted on 18 Nov 2024
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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