Apache ActiveMQ could allow a remote attacker to traverse directories on the system, caused by an error in the fileserver upload/download functionality. By placing a jsp file in the admin console, an attacker could exploit this vulnerability to execute arbitrary shell commands on the system.

Apache ActiveMQ 5.x before 5.13.0 does not restrict the classes that can be serialized in the broker, which allows remote attackers to execute arbitrary code via a crafted serialized Java Message Service (JMS) ObjectMessage object.

Apache ActiveMQ could allow a remote attacker to hijack the clicking action of the victim, caused by the failure to set the X-Frame-Options header in HTTP responses by the Administrative Web console. By persuading a victim to visit a malicious Web site, a remote attacker could exploit this vulnerability to hijack the victim's click actions.

Apache ActiveMQ is vulnerable to cross-site scripting, caused by improper validation of user-supplied input by the web based administration console. A remote attacker could exploit this vulnerability using a specially-crafted URL to execute script in a victim's Web browser within the security context of the hosting Web site, once the URL is clicked. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.