What does one do if he forgets to recite al-Fatihah in a quiet prayer behind the imam?
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Question:
Some people, if they make a mistake or forget to recite al-Fatihah while praying behind the imam in a quiet prayer, stand up after the taslim and perform a rak'ah. Is this action valid?
Answer:
If he follows the view of those who hold that reciting al-Fatihah is a pillar (rukn) for the ma'mum, then his action is valid according to what he believes. However, if he follows the opinion of the majority, the ma'mum is not required to recite al-Fatihah; the imam's recitation is sufficient. Yes. Even those who said that it is obligatory for the ma'mum to recite al-Fatihah behind the imam did not say that it is a pillar; they said it is obligatory (wajib) for the ma'mum, but not a pillar. In this case. Yes.
Some people, if they make a mistake or forget to recite al-Fatihah while praying behind the imam in a quiet prayer, stand up after the taslim and perform a rak'ah. Is this action valid?
Answer:
If he follows the view of those who hold that reciting al-Fatihah is a pillar (rukn) for the ma'mum, then his action is valid according to what he believes. However, if he follows the opinion of the majority, the ma'mum is not required to recite al-Fatihah; the imam's recitation is sufficient. Yes. Even those who said that it is obligatory for the ma'mum to recite al-Fatihah behind the imam did not say that it is a pillar; they said it is obligatory (wajib) for the ma'mum, but not a pillar. In this case. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، ماذا يفعل من سها ونسي الفاتحة في الصلاة السرية خلف الإمام؟ للشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.