account.asp in DUware DUclassmate 1.0 through 1.1 allows remote attackers to change the passwords for arbitrary users by modifying the MM_recordId parameter on the "My Account" page.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17682
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-2190
http://www.securitytracker.com/alerts/2004/Oct/1011597.html