From the FAQ: http://www.webmin.com/faq.html
Quote:

How do I change my Webmin password if I can't login?
Included with the Webmin distribution is a program called changepass.pl to solve precisely this problem. Assuming you have installed Webmin in /usr/local/webmin-1.150, you could change the password of the admin user to foo by running
/usr/local/webmin-1.150/changepass.pl /etc/webmin admin foo 
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