CVE-2026-34197: Apache ActiveMQ Improper Input Validation, actively exploited

Description

Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ. Apache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia/ on the web console. The default Jolokia access policy permits exec operations on all ActiveMQ MBeans (org.apache.activemq:*), including BrokerService.addNetworkConnector(String) and BrokerService.addConnector(String). An authenticated attacker can invoke these operations with a crafted discovery URI that triggers the VM transport's brokerConfig parameter to load a remote Spring XML application context using ResourceXmlApplicationContext. Because Spring's ResourceXmlApplicationContext instantiates all singleton beans before the BrokerService validates the configuration, arbitrary code execution occurs on the broker's JVM through bean factory methods such as Runtime.exec(). This issue affects Apache ActiveMQ Broker: before 5.19.4, from 6.0.0 before 6.2.3; Apache ActiveMQ All: before 5.19.4, from 6.0.0 before 6.2.3; Apache ActiveMQ: before 5.19.4, from 6.0.0 before 6.2.3. Users are recommended to upgrade to version 5.19.4 or 6.2.3, which fixes the issue

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache Activemq≥ 6.0.0 < 6.2.3 · < 5.19.4

Apache Activemq Broker≥ 6.0.0 < 6.2.3 · < 5.19.4

Remediation

Fixed in

Apache Activemq≥ 6.2.3

Apache Activemq Broker≥ 6.2.3

Patch & vendor advisories

https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt

References

https://access.redhat.com/security/cve/CVE-2026-34197Third Party Advisory
https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txtVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2455869Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34197.jsonThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34197US Government Resource
http://www.openwall.com/lists/oss-security/2026/04/06/3Mailing ListThird Party Advisory

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-34197 being actively exploited?

Yes. CVE-2026-34197 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 16 Apr 2026.

How severe is CVE-2026-34197?

CVE-2026-34197 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 15.5% probability of exploitation.

Which products are affected by CVE-2026-34197?

Affected products include Apache Activemq, Apache Activemq Broker.

How do I fix CVE-2026-34197?

Upgrade affected software to a fixed version, for example Apache Activemq 6.2.3, Apache Activemq Broker 6.2.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34197 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation works Book a demo