SQL-Ledger 2.4.4 through 2.6.17 authenticates users by verifying that the value of the sql-ledger-[username] cookie matches the value of the sessionid parameter, which allows remote attackers to gain access as any logged-in user by setting the cookie and the parameter to the same value.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28671
http://www.sql-ledger.org/cgi-bin/nav.pl?page=news.html&title=What%27s%20New
http://www.securityfocus.com/bid/19758
http://www.securityfocus.com/archive/1/444741/100/0/threaded