Blackboard Academic Suite 6.0 and earlier does not properly clear session information when de-authenticating a user who is idle, which allows subsequent users to log in as the previous user and gain privileges. NOTE: the vendor has disputed this issue, saying that "This is a customer specific issue related to their Kerberos authentication single sign-on application and not a vulnerability in the Blackboard product.

Cross-site scripting vulnerabilities in Blackboard 5 allow remote attackers to execute arbitrary web script via (1) the course_id parameter in a link to login.pl, (2) the CTID parameter in ProcessInfo.cgi, or (3) the Message parameter in index.cgi.