GHSA-hg6c-8mvr-jqc9 · Severity: high — Improper Input Validation, Improper Control of Generation of Code ('Code Injection')...
Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ All, 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). An authenticated attacker can invoke these operations with a crafted discovery URI that triggers the VM transport's brokerConfig parameter using the "masterslave:// " URL which can allow loading a 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 5.19.7, from 6.0.0 before 6.2.6; Apache ActiveMQ All: before 5.19.7, from 6.0.0 before 6.2.6; Apache ActiveMQ: before 5.19.7, from 6.0.0 before 6.2.6. Users are recommended to upgrade to version 5.19.7 or 6.2.6, which fixes the issue.
Conclusion & alert: CVE-2026-42588 is rated Low Risk (39.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.06%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-01 | — | 0.06% | — |
Full EPSS history (1 record total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.1 | 3.1 | HIGH |
|
2.8 | 5.2 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
GHSA-hg6c-8mvr-jqc9 · Severity: high — Improper Input Validation, Improper Control of Generation of Code ('Code Injection')...
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-42588 not yet assigned priority: Debian including 1 source packages (activemq), 4 status rows across 4 suites (bookworm, bullseye, sid, trixie): open 4. | https://security-tracker.debian.org/tracker/CVE-2026-42588 |
ubuntu
|
medium | CVE-2026-42588 medium priority: Ubuntu including 1 source packages (activemq), 7 status rows across 7 suites (bionic, focal, jammy, noble, questing, resolute, upstream): needs-triage 7. | https://ubuntu.com/security/CVE-2026-42588 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| apache | activemq | < 5.19.7 | cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* |
| apache | activemq | >= 6.0.0, < 6.2.6 | cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* |
| apache | activemq_broker | < 5.19.7 | cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:* |
| apache | activemq_broker | >= 6.0.0, < 6.2.6 | cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/ns0zktfo16s9ql2mmtqtlb6p6xcs45xm | Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/05/31/18 | Mailing List Third Party Advisory |