Apache ActiveMQ Improper Input Validation Vulnerability
Apache ActiveMQ contains an improper input validation vulnerability that allows for code injection.
Quick answer
Apache ActiveMQ should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
Treat CVE-2026-34197 as an actively exploited Apache ActiveMQ Classic code injection risk. Apache and OSV state that affected ActiveMQ Broker and activemq-all versions before 5.19.4, and 6.0.0 before 6.2.3, can allow authenticated users to achieve remote code execution through Jolokia MBeans. Upgrade to ActiveMQ 5.19.4 or 6.2.3 or later, and restrict the web console and Jolokia endpoint to trusted administrators only. Because the issue can execute code in the broker JVM, inspect broker hosts for compromise before considering remediation complete.
- Inventory every Apache ActiveMQ Classic broker, web console, Jolokia endpoint, container image, and bundled activemq-all dependency.
- Identify ActiveMQ 5.x deployments below 5.19.4 and 6.x deployments from 6.0.0 below 6.2.3 as affected.
- Upgrade affected brokers and dependencies to ActiveMQ 5.19.4, 6.2.3, or a later supported release.
- Restrict /api/jolokia/ and the ActiveMQ web console to trusted administrator networks, VPN, or private management paths only.
- Disable unnecessary Jolokia operations or web console exposure where business workflows do not require them.
- Review broker logs, JVM logs, shell history, process trees, and EDR telemetry for suspicious connector changes or Runtime.exec-style behavior.
- Rotate broker credentials, JMX credentials, application secrets, and message broker tokens if exploitation is suspected.
- Rebuild broker hosts or containers from trusted images if arbitrary code execution indicators are present.
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Verify the fix
- Confirm all ActiveMQ 5.x deployments report 5.19.4 or later and all ActiveMQ 6.x deployments report 6.2.3 or later.
- Confirm /api/jolokia/ and the web console are not reachable from untrusted networks.
- Confirm dependency and container scans no longer report CVE-2026-34197.
- Review post-upgrade broker logs for failed exploit attempts, unexpected MBean operations, or suspicious connector changes.
- Run a Fixnx scan against public broker hostnames and management endpoints to confirm exposure is reduced.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-34197?
Apache ActiveMQ should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
Why can this risk appear in multiple categories?
A vulnerability can belong to more than one platform or ecosystem. Fixnx keeps one canonical risk page while also listing it in every relevant category.