CVE-2026-34197: Apache ActiveMQ Improper Input Validation Vulnerability

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• Yes, if you run Apache ActiveMQ. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-04-16, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-04-30; treat that as the outer limit, not the target.
• EPSS 15.5%, percentile 97: FIRST’s model estimates a 15.5% chance of exploitation activity in the next 30 days, higher than 97% of all scored CVEs (very high). EPSS is a probability, not a verdict.
• Needs an account (low (any account)). Exposure depends on who can log in.

What it is

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

CISA’s summary

Apache ActiveMQ contains an improper input validation vulnerability that allows for code injection.

Weakness type: CWE-20, CWE-94, CWE-78.

Product: Apache ActiveMQ · Assigned by: apache · Published: 2026-04-07

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Privileges required: low (any account)
• User interaction: none
• Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: added 2026-04-16; federal due date 2026-04-30. Known ransomware use: Unknown.
• CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
• CISA SSVC assessment: exploitation active, automatable no, technical impact total.
• FIRST EPSS (model of 2026-10-21): 15.49% probability of exploitation activity in the next 30 days; percentile 97.

Timeline

• 2026-04-07 — CVE record published by apache
• 2026-04-16 — Added to CISA’s Known Exploited Vulnerabilities catalog
• 2026-04-30 — CISA remediation deadline for US federal agencies
• 2026-08-17 — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

1. activemq.apache.org activemq.apache.org

Vulnerability records

1. CVE.org record CVE-2026-34197 cve.org
2. NVD entry CVE-2026-34197 nvd.nist.gov

Government

1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov

Other references from the CVE record and advisory

1. openwall.com openwall.com
2. access.redhat.com access.redhat.com
3. RHBZ#2455869 bugzilla.redhat.com
4. security.access.redhat.com security.access.redhat.com

All exploited Apache vulnerabilities · Today’s Security Digest