Is it permissible to perform salah in front of mirror?
بسم الله الرحمن الرحيم
(Fatwa: 467/385/B=4/1439)
It is lawful, Salah will be valid. But it is better to cover it with curtain so that you can avoid seeing the reflection of yourself or others in the mirror.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband