When Backbiting Is Allowed? – Islamic Center of Reseda

When is Backbiting allowed?
What are the 6 exceptions for backbiting?

What are the situations in which gheebah (backbiting or talking about others in their absence) is permitted?

Answer:
The scholars have stated that Gheebah is permitted in certain situations:

Oppression: It is permissible for the one who has been wronged to complain to the ruler or judge and others who have the authority or ability to settle the score with the one who wronged him.
Changing Evil: Seeking change evil and bring the sinner back to the right path, so he may say to the one who he hopes is able to do something: “So and so is doing such and such; tell him not to do it.”
Seeking Fatwa: So and so/my father/my brother has wronged me by doing such and such, does he have the right to do that? How can I solve this problem and ward off his harm from me?”
Warning Muslims: Someone’s evil, such as highlighting the weakness of some reporters or witnesses or authors. That also includes seeing someone buying faulty goods, or someone keeping company with one who is a thief or adulterer, or giving a female relative of his to such a man in marriage, and the like. You should tell them about that by way of sincere advice, not with the aim of causing harm and spreading mischief.
Openly Transgressing: If a person openly commits evil or follows bid’ah, such as drinking alcohol and seizing people’s wealth unlawfully, it is permissible to speak of what he is doing openly, but it is not permissible to speak against him any other way, unless it is for another reason.
Identification: If someone is known by a nickname such as the lame one, it is permissible to identify him as such, but it is Haram to mention that by way of belittling him, and if it is possible to identify him in some other way, that is better.

Speaking about a person in his absence is permissible in certain situations, if there is a need for that, such as if someone consults you about arranging a marriage to him, or entering into a business partnership with him, or if someone complains to the authorities to put a stop to his wrongdoing. In that case there is nothing wrong with saying things about him that he may not like to be said, because there is an interest to be served by that.

Reference:
الحالات التي تجوز فيها الغيبة