Multiple incomplete blacklist vulnerabilities in the serendipity_isActiveFile function in include/functions_images.inc.php in Serendipity before 2.0.2 allow remote authenticated users to execute arbitrary PHP code by uploading a file with a (1) .pht or (2) .phtml extension.
SQL injection vulnerability in the serendipity_checkCommentToken function in include/functions_comments.inc.php in Serendipity before 2.0.2, when "Use Tokens for Comment Moderation" is enabled, allows remote administrators to execute arbitrary SQL commands via the serendipity[id] parameter to serendipity_admin.php.
Cross-site scripting (XSS) vulnerability in templates/2k11/admin/entries.tpl in Serendipity before 2.0.1 allows remote authenticated editors to inject arbitrary web script or HTML via the serendipity[cat][name] parameter to serendipity_admin.php, when creating a new category.
Cross-site scripting (XSS) vulnerability in spell-check-savedicts.php in the htmlarea SpellChecker module, as used in Serendipity before 1.7.3 and possibly other products, allows remote attackers to inject arbitrary web script or HTML via the to_r_list parameter.