Executive brief
Apache ActiveMQ is a popular message broker used to facilitate communication between different software applications. A security flaw allows unauthorized individuals to view sensitive metadata about message subscriptions, including client IDs and topic names, without logging in. This information could be used by attackers to map out internal messaging structures or intercept business-sensitive communication patterns.
Technical details
An information disclosure vulnerability (CWE-1230) exists in Apache ActiveMQ when brokers are configured with a network connector and 'syncDurableSubs' is set to true. The broker fails to enforce authentication before responding to 'BrokerInfo' commands via the OpenWire protocol. An unauthenticated remote attacker can exploit this to obtain a list of all durable topic subscriptions, including client identifiers, subscription names, topic destinations, and JMS selector expressions. The issue is resolved in versions 5.19.7 and 6.2.6.
Affected products
- Apache ActiveMQ Broker 5.14.0 to 5.19.6, 6.0.0 to 6.2.5
- Apache ActiveMQ All 5.14.0 to 5.19.6, 6.0.0 to 6.2.5
Timeline
- 2026-05-31: disclosed: Initial disclosure on oss-security mailing list
- 2026-06-01: advisory: GitHub and NVD advisories published