Tiki CMS/Groupware (TikiWiki) 1.8.1 and earlier allows remote attackers to gain sensitive information via a direct request to (1) banner_click.php, (2) categorize.php, (3) tiki-admin_include_directory.php, (4) tiki-directory_search.php, which reveal the web server path in an error message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/15847
http://tikiwiki.org/tiki-read_article.php?articleId=66