Do subdomains of a TLD with mandatory HTTPS require a wildcard certificate?

Many new TLDs have mandatory HTTPS requirements. Is there a way to disable that for subdomains? If not does that mean an expensive wildcard SSL certificate will need to be used with these domains?
So if I have a service running at sub.doma… Continue reading Do subdomains of a TLD with mandatory HTTPS require a wildcard certificate?

Can strict ‘Referer’ validation also be bypassed with vulnerable subdomains?

I have been researching various common techniques for preventing CSRF attacks, such as SameSite, Secure, and CSRF Tokens, and how they can be bypassed. I found that the following vulnerabilities exist:

A website’s subdomain or sibling dom… Continue reading Can strict ‘Referer’ validation also be bypassed with vulnerable subdomains?

Are there any security reasons against "drop-www" (using example.com instead of www.example.com)?

Are there any security reasons against "drop-www"?
In other words, are there any security reasons against using an apex [1] domain name such as example.com instead of a subdomain such as www.example.com?
Quote https://www.bjornjo… Continue reading Are there any security reasons against "drop-www" (using example.com instead of www.example.com)?