Although most Apple users install updates right away, there is always an exception. If you are one of those people who do not update their devices, you should know that the letter "d" is not always the letter "d" when it appears in the Safari address bar.
It may not sound serious to you, but it is a very important problem because it can lead you to adventures according to various security researchers.
IDN homogeneity attacks can occur if you write a domain name with Unicode characters that resemble typical Latin letters, but they are not.
These domains are used for phishing, and they deceive users to think they have access to a regular site instead of a cleverly created clone.
Xisigr, a security researcher at Tencent Security Xuanwu Lab, recently discovered how they manage Apple's Unicode characters.
The character looks like a regular letter 'd', except that it has a lower apostrophe. So xisigr discovered that Safari did not display the apostrophe, but showed the letter dum as the Latin letter d.
The researcher reported his findings to Apple, which released security updates in July for Safari, and the software for iOS, macOS, tvOS and watchOS.