Serendipity before 2.3.4 on Windows allows remote attackers to execute arbitrary code because the filename of a renamed file may end with a dot. This file may then be renamed to have a .php filename.

Serendipity before 2.1.5 has XSS via EXIF data that is mishandled in the templates/2k11/admin/media_choose.tpl Editor Preview feature or the templates/2k11/admin/media_items.tpl Media Library feature.

Serendipity through 2.0.5 allows CSRF for the installation of an event plugin or a sidebar plugin.

comment.php in Serendipity through 2.0.5 allows CSRF in deleting any comments.

Open redirect vulnerability in comment.php in Serendipity through 2.0.5 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the HTTP Referer header.

include/functions_installer.inc.php in Serendipity through 2.0.5 is vulnerable to File Inclusion and a possible Code Execution attack during a first-time installation because it fails to sanitize the dbType POST parameter before adding it to an include() call in the bundled-libs/serendipity_generateFTPChecksums.php file.

Multiple cross-site scripting (XSS) vulnerabilities in Serendipity before 2.0.5 allow remote authenticated users to inject arbitrary web script or HTML via a category or directory name.

In Serendipity before 2.0.5, an attacker can bypass SSRF protection by using a malformed IP address (e.g., http://127.1) or a 30x (aka Redirection) HTTP status code.

Cross-site scripting (XSS) vulnerability in Serendipity before 2.0.3 allows remote attackers to inject arbitrary web script or HTML via the serendipity[entry_id] parameter in an "edit" admin action to serendipity_admin.php.

Cross-site scripting (XSS) vulnerability in js/2k11.min.js in the 2k11 theme in Serendipity before 2.0.2 allows remote attackers to inject arbitrary web script or HTML via a user name in a comment, which is not properly handled in a Reply link.

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.