Blackboard Learning and Community Portal System in Academic Suite 6.3.1.424, 6.2.3.23, and other versions before 6 allows remote attackers to list all available categories via a blank category_id parameter to category.pl. NOTE: it is not clear whether this information is sensitive or not, so this might not be an exposure.
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub