Konqueror Embedded and KDE 2.2.2 and earlier does not validate the Common Name (CN) field for X.509 Certificates, which could allow remote attackers to spoof certificates via a man-in-the-middle attack.
http://www.turbolinux.com/security/TLSA-2003-36.txt
http://www.securityfocus.com/bid/7520
http://www.securityfocus.com/archive/1/320707
http://www.redhat.com/support/errata/RHSA-2003-193.html
http://www.redhat.com/support/errata/RHSA-2003-192.html
http://www.kde.org/info/security/advisory-20030602-1.txt
http://www.debian.org/security/2003/dsa-361
http://lists.grok.org.uk/pipermail/full-disclosure/2003-May/004983.html