Batch / Find And Edit specific location in TXT or XML file and replace it with random

i want to replace a text file which contain a password in a line to the same text file but random password

EXAMPLE:

01 username:admin
02 password:12345678
03 login

i want to let the batch file to locate the "12345678" and edit it with random 8-digit numbers like this:

01 username:admin
02 password:72957823
03 login