Konqueror in KDE 3.0 through 3.0.2 does not properly detect the "secure" flag in an HTTP cookie, which could cause Konqueror to send the cookie across an unencrypted channel, which could allow remote attackers to steal the cookie via sniffing.
The SSL capability for Konqueror in KDE 3.0.2 and earlier does not verify the Basic Constraints for an intermediate CA-signed certificate, which allows remote attackers to spoof the certificates of trusted sites via a man-in-the-middle attack.
Format string vulnerability in kvt in KDE 1.1.2 may allow local users to execute arbitrary commands via a DISPLAY environmental variable that contains formatting characters.