Executive brief
Apache ActiveMQ is a popular open-source message broker used to facilitate communication between different software applications. A security flaw in how the system handles 'temporary destinations' allows unauthorized users to intercept or consume messages intended for other connections. This could lead to the exposure of sensitive data being transmitted through the message broker.
Technical details
A missing authorization vulnerability exists in Apache ActiveMQ Classic where temporary destinations are not properly isolated to the connection that created them. The root cause is that isolation checks are performed only on the client side rather than being enforced by the broker. An attacker with a valid connection to the broker can exploit this to consume messages from a temporary destination belonging to a different connection. This affects ActiveMQ Broker, ActiveMQ All, and ActiveMQ versions prior to 5.19.8 and 6.x versions prior to 6.2.7. Users should upgrade to version 6.2.7 to resolve this issue.
Affected products
- Apache Software Foundation ActiveMQ Broker before 5.19.8, 6.0.0 before 6.2.7
- Apache Software Foundation ActiveMQ All before 5.19.8, 6.0.0 before 6.2.7
- Apache Software Foundation ActiveMQ before 5.19.8, 6.0.0 before 6.2.7
Timeline
- 2026-06-30: disclosed
- 2026-06-30: advisory