Multiple cross-site scripting (XSS) vulnerabilities in admin.php in Piwigo before 2.3.4 allow remote attackers to inject arbitrary web script or HTML via the (1) section parameter in the configuration module, (2) installstatus parameter in the languages_new module, or (3) theme parameter in the theme module.
Piwigo 2.1.5 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by tools/metadata.php and certain other files.