PhpWiki is an application that creates a web site where anyone can edit the pages through HTML forms.
Earlier versions of PhpWiki contain an XML-RPC library that improperly handles XML-RPC requests and responses with malformed nested tags.
A remote attacker could exploit this vulnerability to inject arbitrary PHP script code into eval() statements by sending a specially crafted XML document to PhpWiki.
There is no known workaround at this time.
All PhpWiki users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=www-apps/phpwiki-1.3.10-r2"