SQL injection vulnerability in Mambo 4.5.3, 4.5.3h, and possibly earlier versions allows remote attackers to execute arbitrary SQL commands via (1) the $username variable in the mosGetParam function and (2) the $task parameter in the mosMenuCheck function in (a) includes/mambo.php; and (3) the $filter variable to the showCategory function in the com_content component (content.php).
https://exchange.xforce.ibmcloud.com/vulnerabilities/24951
http://www.vupen.com/english/advisories/2006/0719
http://source.mambo-foundation.org/view/news/Announcements/Security_Patch_Released/