Wa alaikum salaam,
You should tell them that the information is not correct.
If you would be asked say the truth. As long as you said the truth in the interview and you are qualified for the job, I hope that this is enough.

Assalam o Aliekum, I have a query. There was a job opportunity where my friend isworking. There was vacant position, my friend asked for my CV. He altered my CV with some extra experience and forward to managerAfter a day a person interviewed me, and i told him every thing truly. but unable to clear to the manager.should I join that job, if the manager still not informed, who has to approve? As i mentioned in the question that i told the truth to interviewer, butunable to tell the manager because i had no conversation with him. Inthis case if i have been selected, so what should i do. As i know the manager was not informed, but i have Cleared to the interviewer form my side.