TikiWiki is an open source content management system written in PHP.
A remote attacker can craft the "movies" parameter to run a directory traversal attack through a ".." sequence and read the first 1000 bytes of any arbitrary file, or conduct a cross-site scripting (XSS) attack through the "area_name" parameter. This attack can be exploited to execute arbitrary HTML and script code in a user's browser session, allowing for the theft of browser session data or cookies in the context of the affected web site. The impacts of the unspecified vulnerabilities are still unknown.
There is no known workaround at this time.
All TikiWiki users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=www-apps/tikiwiki-1.9.9"