Can I recover password stored in WinSCP session?

Yes you can. That’s why you should NOT store your password to WinSCP session. Read more about security of stored credentials.

There are lots of tools allowing recovery of your password. E.g. search the Internet for “FTP password recovery”.

Remember, once you recover your password, change it to a new one, and do NOT store it again! If you want to continue storing it, protected it by master password.