login.php in Pligg CMS 9.5 uses a guessable confirmation code when resetting a forgotten password, which allows remote attackers with knowledge of a username to reset that user's password by calculating the confirmationcode parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34512
http://archives.neohapsis.com/archives/bugtraq/2007-05/0383.html