GHSA-w3w2-mpp5-92gm · Severity: high · Ecosystem: maven — Apache ActiveMQ Vulnerable to Improper Input Validation and Code Injection
Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ. An authenticated attacker may bypass the fix in CVE-2026-34197 by adding a connector using an HTTP Discovery transport via BrokerView.addNetworkConnector or BrokerView.addConnector through Jolokia if the activemq-http module is on the classpath. A malicious HTTP endpoint can return a VM transport through the HTTP URI which will bypass the validation added in CVE-2026-34197. The attacker can then use 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 5.19.6, from 6.0.0 before 6.2.5; Apache ActiveMQ All: before 5.19.6, from 6.0.0 before 6.2.5; Apache ActiveMQ: before 5.19.6, from 6.0.0 before 6.2.5. Users are recommended to upgrade to version 5.19.6 or 6.2.5, which fixes the issue.
Conclusion & alert: CVE-2026-40466 is rated High Risk (70.8/100): CVSS High severity, with high exploitation likelihood (EPSS 18.01%, 95th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.22% over the last day, indicating growing attacker interest. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
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 | 2026-05-26 | 15.79% | 18.01% | +2.22% |
| 2 | 2026-05-22 | 10.33% | 15.79% | +5.46% |
| 3 | 2026-05-12 | — | 10.33% | — |
Full EPSS history (6 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.8 | 3.1 | HIGH |
|
2.8 | 5.9 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
GHSA-w3w2-mpp5-92gm · Severity: high · Ecosystem: maven — Apache ActiveMQ Vulnerable to Improper Input Validation and Code Injection
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-40466 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-2026-40466 |
ubuntu
|
medium | CVE-2026-40466 medium priority: Ubuntu including 1 source packages (activemq), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, resolute, upstream, xenial): needs-triage 8. | https://ubuntu.com/security/CVE-2026-40466 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| apache | activemq | < 5.19.6 | cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* |
| apache | activemq | >= 6.0.0, < 6.2.5 | cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* |
| apache | activemq_broker | < 5.19.6 | cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:* |
| apache | activemq_broker | >= 6.0.0, < 6.2.5 | cpe:2.3:a:apache:activemq_broker:*:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt | Not Applicable |