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Imaam remembers that he forgot to recite al-Faatihah during a silent rak’ah
If the imaam remembers in the final tashahhud (sitting of the prayer) that he had recited at-tahiyyaat (the greetings mentioned during the sitting) in the beginning of a silent rak‘ah instead of al-Faatihah, he should stand up and offer another, correct, rak‘ah, to make up for the one he performed incorrectly where he did not recite al-Faatihah. This is because the Prophet (peace and blessings of Allaah be upon him) said: “There is no prayer for the one who did not recite (in it) al-Faatihah (the opening chapter of the Qur’an).” (Saheeh al-Bukhaari, no. 723)
It is also required for the members of the congregation behind him to follow him, even though it would be the fifth rak‘ah for them. If they do not understand and do not stand up, but say “subhaan Allah” as if to indicate to the imaam that he is in error, the imaam should gesture with hand movements to the right and left to inform them that he did it purposefully and to indicate to them that they should stand up and that he knows what he is doing.
However, if something like this happens to one of the people praying behind the imaam, his prayer will be correct as long as he followed the imaam.
The evidence for this is the hadeeth of Abu Bakrah which describes when he joined the prayer in the position of rukoo‘ and did not recite al-Faatihah. The Prophet (peace and blessings of Allaah be upon him) said to him: “May Allah increase your endeavor. You do not need to repeat.” (Saheeh al-Bukhaari, no. 750).