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What about the botnet security advisory at http://isc.sans.org/diary.php?storyid=1672?
Sites that are running with PHP's register_globals setting set to "On" and versions of PmWiki prior to 2.1.21 may be vulnerable to a botnet exploit that is taking advantage of a bug in PHP. The vulnerability can be closed by turning register_globals off, upgrading to PmWiki 2.1.21 or later, or upgrading to PHP versions 4.4.3 or 5.1.4. In addition, there is a test at PmWiki:SiteAnalyzer that can be used to determine if your site is vulnerable.
This page may have a more recent version on pmwiki.org: PmWiki:Security, and a talk page: PmWiki:Security-Talk.