Multiple cross-site scripting (XSS) vulnerabilities in JBlog 1.0 allow remote attackers to inject arbitrary web script or HTML via the (1) id parameter to (a) index.php, or the (2) search parameter or (3) theme cookie to (b) recherche.php.

admin/ajoutaut.php in JBlog 1.0 does not require authentication, which allows remote attackers to create arbitrary accounts via modified mot and droit parameters.

Multiple SQL injection vulnerabilities in JBlog 1.0 allow (1) remote attackers to execute arbitrary SQL commands via the id parameter to index.php, and allow (2) remote authenticated administrators to execute arbitrary SQL commands via the id parameter to admin/modifpost.php.