Cross-site request forgery (CSRF) vulnerability in deans_permalinks_migration.php in the Dean's Permalinks Migration 1.0 plugin for WordPress allows remote attackers to modify the oldstructure (aka dean_pm_config[oldstructure]) configuration setting as administrators via the old_struct parameter in a deans_permalinks_migration.php action to wp-admin/options-general.php, as demonstrated by placing an XSS sequence in this setting.