The rc4encrypt function in lib/moodlelib.php in Moodle 1.9.x before 1.9.16, 2.0.x before 2.0.7, 2.1.x before 2.1.4, and 2.2.x before 2.2.1 uses a hardcoded password of nfgjeingjk, which makes it easier for remote attackers to defeat cryptographic protection mechanisms by reading this script's source code within the open-source software distribution.
https://bugzilla.redhat.com/show_bug.cgi?id=783532
http://www.debian.org/security/2012/dsa-2421
http://moodle.org/mod/forum/discuss.php?d=194013
http://git.moodle.org/gw?p=moodle.git%3Ba=commit%3Bh=98456628a24bba25d336860d38a45b5a4e3895da