Can I recover password stored in WinSCP session?

Yes you can. And in fact anybody with access to your computer can do it too. That’s why you should NEVER store your password to WinSCP session without using master password. 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, protect it by master password.