TeamPass before 2.1.20 allows remote attackers to bypass access restrictions via the language file path in a (1) request to index.php or (2) "change_user_language" request to sources/main.queries.php.
https://github.com/nilsteampassnet/TeamPass/commit/fd549b245c0f639a8d47bf4f74f92c37c053706f
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-3710
http://www.openwall.com/lists/oss-security/2014/05/19/5