Change your password immediately!
I use Yahoo Mail for some of my personal accounts. It’s never been a secure server.
“I would have trouble trusting Yahoo going forward,” remarked a cryptologist. Posted honorably on Yahoo News.
So their PR response is apt, but still the security implications are clear.
A few years ago it was hacked and all my contacts were spammed. They were sent emails with spam links in my name.
My advice: delete your contacts.
It may be a pain to look up your saved email accounts but it’s worth it.
It’s quite embarrassing to have to send out a sorry email to all your friends and colleagues.
Apparently over a billion accounts were hacked a few years ago. Despite claims that it was only a fraction.
Despite the length of time, I’d still change your password. You never know what hackers could still obtain from old data.