VulnerabilityAnalyzed

CVE-2026-34197

Apache ActiveMQ Improper Input Validation Vulnerability

KEVHIGH 8.8EPSS 98.3%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 30 April 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

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: 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 98.26% probability · 100th percentile
CISA KEV: Listed 16 April 2026 · due 30 April 2026
Weakness: CWE-20, CWE-94, CWE-78
Affected: apache/activemq · apache/activemq broker
Source: security@apache.org

CISA notes

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt ; https://nvd.nist.gov/vuln/detail/CVE-2026-34197

References

https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/06/3Mailing List, Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-34197Third Party 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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.