CVE 2008-3102
Mantis 1.1.x through 1.1.2 and 1.2.x through 1.2.0a2 does not set the secure flag for the session cookie in an https session, which can cause the cookie to be sent in http requests and make it easier for remote attackers to capture this cookie.
See the 
CVE page on Mitre.org
for more details.
