Hmm, well I'm not familiar with nikto, but it has to be more than an issue with signature detection.
There is no such Drupal file as userinfo.php, but it is a Xoops file, so something is up.

On Sun, May 22, 2011 at 7:57 AM, Jarry <mr.jarry@gmail.com> wrote:
I believe I have posted to the right list, as all I have
on my web is Drupal. I suppose, nikto was just wrong
in CMS signature detection...

Jarry

On 22. 5. 2011 12:35, William Smith wrote:
> You may get lucky and someone might happen to know the answer to this,
> but I believe that you've posted to the wrong list.
> This is a Drupal support list, not Xoops.
>
> <mailto:mr.jarry@gmail.com>> wrote:
>
>     Hi,
>     I just scanned my web with nikto and received this message:
>
>     + /userinfo.php?uid=1;: Xoops portal gives detailed error
>     messages including SQL syntax and may allow an exploit
>
>     So my question is: how can I turn these detailed messages off?


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