Gentoo has issued an update for mantis. This fixes some vulnerabilities, where some have unknown impacts and others potentially can be exploited by malicious people to conduct cross-site scripting, HTTP response splitting, and SQL injection attacks.

For more information:
SA18181

Solution
Update to "www-apps/mantisbt-0.19.4" or later.
Original Advisory
http://www.gentoo.org/security/en/glsa/glsa-200512-12.xml

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers