Posted By: JKKDARK
MyBB is a is a freeware, visible source bulletin board system software package.
http://community.mybboard.net/thread-36022.html
MyBB 1.4.1 is a general maintenance release and a security update to the MyBB 1.4 series. It fixes medium and low risk security vulnerabilities. We recommend everybody upgrades to this release immediately or patches their boards with the manual patching instructions below.
These vulnerabilities affect MyBB 1.4 and previous releases of MyBB 1.2 (including 1.2.14). Older versions of MyBB may also be affected. Please see the post below for upgrade instructions for 1.2.14.
WDZ is credited with the discovery of these vulnerabilities.
More information in the link