Two vulnerabilities have been reported in PostNuke, which can be exploited by malicious people to bypass certain security restrictions and disclose sensitive information.

1) A local file inclusion vulnerability in the GeSHi library can be exploited to disclose the content of arbitrary files via the "pn_bbcode" module.

For more information:
SA16898

2) An error in the comments module can be exploited by malicious people to add comments.

The vulnerabilities have been reported in versions prior to 0.761.

Solution
Update to version 0.761.
Further details available to Secunia VIM customers

Provided and/or discovered by
1) Maksymilian Arciemowicz
2) Devin Hayes

Original Advisory
http://news.postnuke.com/index.php?name=News&file=article&sid=2726
http://news.postnuke.com/index.php?name=News&file=article&sid=2727

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers