Yea 5.6 is vulnerable too.

I would suggest to upgrade to 5.6 just because its latest (besides 6beta) and then go to http://www.phpnuke.org/modules.php?n...download&cid=9 and select


PHP-Nuke 5.6 Bug Fixes
Description: Fixes two bugs. One in the banners addition and one security hole in Private Messages.
Version: 5.6 Filesize: 5.51 Kb
Added on: 16-Aug-2002 Downloads: 2433

this will fix it for you

or you could go to http://digital-delusions.dyn.ee/expl...nukesploit.txt and there is instructions on how to fix it manually . This is the person that found the exploit and submitted to bugtraq