Cross-site scripting vulnerabilities in SquirrelMail 1.2.7 and earlier allows remote attackers to execute script as other web users via (1) addressbook.php, (2) options.php, (3) search.php, or (4) help.php.
http://www.redhat.com/support/errata/RHSA-2002-204.html
http://www.iss.net/security_center/static/10145.php
http://www.debian.org/security/2002/dsa-191
http://sourceforge.net/project/shownotes.php?group_id=311&release_id=110774