CVE-2026-74761: Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Spoofing of RemoveSubscription clientId

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-09 · updated 2026-09-18
Weakness: CWE-20

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.

Affected products

Apache ActiveMQ: before 5.19.11; from 6.0.0 before 6.3.2 — fixed in 5.19.11, 6.3.2
Apache Activemq All: before 5.19.11; from 6.0.0 before 6.3.2 — fixed in 5.19.11, 6.3.2
Apache Activemq Broker: before 5.19.11; from 6.2.0 before 6.3.2 — fixed in 5.19.11, 6.3.2

How to fix

Upgrade to a fixed version: Apache ActiveMQ 5.19.11, 6.3.2; Apache Activemq All 5.19.11, 6.3.2; Apache Activemq Broker 5.19.11, 6.3.2. Check the vendor advisory for mitigations.

References

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