awstats <= 6.5 reportedly has a cross site scripting vulnerability via the "config" parameter. http://nvd.nist.gov/nvd.cfm?cvename=CVE-2006-1945
*** Bug 190920 has been marked as a duplicate of this bug. ***
Awstats 6.6 is still in beta and did not work for me (update gave "Use of uninitialized value in substitution (s///) at ..."), so I backported the fix from CVS instead (it's a two-liner). FC-5 and FC-4 versions building, devel is updated to 6.6 and I'll keep it updated when a new beta arrives.