The Prophet (sal Allahu alaihi wa sallam) said, “Allah has cursed the women with extensions in her hair and the one who seeks it.”
[Sahih Al-Bukhari and Muslim]
The connector is also cursed on the tongue of the Messenger (sal Allahu alaihi wa sallam). This is the person who puts extension in their hair whether male or female for simple hair styles under a hat like a wig or complicated hair styles like braiding. This action is cursed and the person who does it is cursed whether or not the extended hair is real human hair or artificial.
Similarly, the one who seeks hair extensions and actively shops for and asks for them or requests hairstyles with extensions in them because his or her hair is short is also cursed by Allah and his Messenger.
This curse is originally targeted at the females only. However, there have been a few males who have wasted their religion, their dignity, their pride and their nobility by extending their hair with extensions or wearing a wig above their bald hair. This is someone who has deserved the curse of Allah and His Messenger (sal Allahu alaihi wa sallam) no matter who he is and Allah says (interpretation of the meaning):
“And whomsoever Allah disgraces, – None can honor him.” [Al-Hajj 22:18]
And Allah knows best!