@Ameer_1 Good catch — go ahead and change that password, and use auto generated passwords in a password manager so you don’t reuse passwords in case of leaks like that.
This feature was literally copied from 1Password’s Watchtower feature, and I believe both just wrap Have I Been Pwned (HIBP). But I agree that it’s a nice feature! 🙂
BUT, I agree that context and caution are important here. I would not click the button in the popup window (go to the affected website using a known safe address in a web browser), especially if the popup appeared when visiting a website or using an app for the first time. In any case, if the warning is not legitimate (an attacker could easily generate graphics identical to Apple’s), changing a password by directly going to an organization’s website won’t cause any harm.
I'm might sound a little silly here, but if I use key chain or safari generated passwords, they'll be very difficult to remember of wanting to log on on another device.
The picture the OP posted is real and he should change his password. The data breach for that message is tied to one of your email accounts, which you should also change the password for.
Probably legit. And can confirm: System Settings > Passwords > Security Recommendations. Will see a list of problem passwords. And if legit, will see the "leaked" entry.