This version is no longer supported
The MyBB 1.6 series reached end of life on October 1, 2015.
This means there will be no more security or maintenance releases for this series and forums running this version of MyBB may be at risk of unfixed security issues. The MyBB Group strongly encourages all communities to upgrade to the latest release of MyBB as soon as possible.
Security vulnerabilities addressed (3)
Forum password bypass in xmlhttp.php
SQL Injection in Grouppromotions module (ACP)
Possible XSS Injection in the error handler
Possible XSS issues in old upgrade files