Severity: moderate 

Affected versions:

- Apache ActiveMQ Broker (org.apache.activemq:activemq-broker) 6.0.0 before 6.3.2
- Apache ActiveMQ Broker (org.apache.activemq:activemq-broker) before 5.19.11
- Apache ActiveMQ All (org.apache.activemq:activemq-all) 6.0.0 before 6.3.2
- Apache ActiveMQ All (org.apache.activemq:activemq-all) before 5.19.11
- Apache ActiveMQ (org.apache.activemq:apache-activemq) 6.0.0 before 6.3.2
- Apache ActiveMQ (org.apache.activemq:apache-activemq) before 5.19.11

Description:

Improper input validation in TopicRegion in Apache ActiveMQ, Apache ActiveMQ Broker, and Apache ActiveMQ All on all platforms.

An authenticated client can spoof clientId when removing a durable topic subscription.

This issue affects Apache ActiveMQ Broker: before 5.19.11, from 6.0.0 before 6.3.2; Apache ActiveMQ All: before 5.19.11, from 6.0.0 before 6.3.2; Apache ActiveMQ: before 5.19.11, from 6.0.0 before 6.3.2.

Users are recommended to upgrade to version 6.3.2 or 5.19.11 which fixes the issue.

Credit:

Wanxin Yin <yhellow123456@gmail.com> (finder)

References:

https://activemq.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-74761