CVE-2026-40466

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 18.0%, top 5% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
90.9%
KEV
Not listed

Published

April 24, 2026

Last Modified

June 30, 2026

Advisory Details (1)

Auto-updated May 2, 2026
No patch confirmed yet.
generic
https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt

Affected Packages

(3 across 1 ecosystem)
Maven(3)
PackageVulnerable rangeFixed inDependents
org.apache.activemq:activemq-all6.0.0 ... 6.2.4 (16 versions)6.2.5—
org.apache.activemq:activemq-broker6.0.0 ... 6.2.4 (16 versions)6.2.5—
org.apache.activemq:apache-activemq6.0.0 ... 6.2.4 (16 versions)6.2.5—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
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  1. 2026-06-19 19:25 UTCEPSS rescore
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  7. 2026-06-14 23:40 UTCEG score recompute
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  20. 2026-06-09 14:44 UTCEG score recompute
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  22. 2026-06-08 14:17 UTCEPSS rescore
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  24. 2026-06-08 04:22 UTCEG score recompute
  25. 2026-06-07 16:47 UTCEG score recompute
  26. 2026-06-07 15:25 UTCEPSS rescore
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  40. 2026-06-04 11:34 UTCEG score recompute
  41. 2026-06-03 23:47 UTCEG score recompute
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  44. 2026-06-02 20:13 UTCEPSS rescore
  45. 2026-06-02 12:53 UTCEG score recompute
  46. 2026-06-02 01:17 UTCEG score recompute
  47. 2026-06-01 13:52 UTCEPSS rescore
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  49. 2026-06-01 13:51 UTCEPSS rescore
  50. 2026-06-01 13:41 UTCEG score recompute
  51. 2026-05-31 22:30 UTCEPSS rescore
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  65. 2026-05-23 00:08 UTCEG score recompute
  66. 2026-05-20 22:38 UTCEPSS rescore
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  68. 2026-05-20 15:55 UTCEG score recompute
  69. 2026-05-20 11:22 UTCEPSS rescore
  70. 2026-05-20 11:22 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-40466.yaml
    First seen Jan 1, 2026

    Apache ActiveMQ - Remote Code Execution via HTTP Discovery Transport Bypass

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40466?
CVE-2026-40466 is a high vulnerability published on April 24, 2026. 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…
When was CVE-2026-40466 disclosed?
CVE-2026-40466 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40466 actively exploited?
CVE-2026-40466 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40466?
CVE-2026-40466 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-40466?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40466, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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