Multiple cross-site scripting (XSS) vulnerabilities in Chyrp 2.1 and earlier allow remote attackers to inject arbitrary web script or HTML via the action parameter to (1) the default URI or (2) includes/javascript.php, or the (3) title or (4) body parameter to admin/help.php.

Directory traversal vulnerability in Chyrp 2.1 and earlier allows remote attackers to include and execute arbitrary local files via a ..%2F (encoded dot dot slash) in the action parameter to the default URI.

upload_handler.php in the swfupload extension in Chyrp 2.0 and earlier relies on client-side JavaScript code to restrict the file extensions of uploaded files, which allows remote authenticated users to upload a .php file, and consequently execute arbitrary PHP code, via a write_post action to the default URI under admin/.

Directory traversal vulnerability in includes/lib/gz.php in Chyrp 2.0 and earlier allows remote attackers to read arbitrary files via a .. (dot dot) in the file parameter, a different vulnerability than CVE-2011-2744.

Multiple cross-site scripting (XSS) vulnerabilities in admin/themes/default/pages/manage_users.twig in the Users Management feature in the admin component in Chyrp before 2.5.1 allow remote authenticated users to inject arbitrary web script or HTML via the (1) user.email or (2) user.website field in a user registration.

Chyrp 2.5.2 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts into post titles. Attackers can craft payloads in the title field that will execute when the post is viewed by other users, potentially stealing session cookies or performing client-side attacks.