Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-w3w2-mpp5-92gm
Advisory ID github_osv/GHSA-w3w2-mpp5-92gm
Aliases CVE-2026-40466
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 7.9
Risk 4.0
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (2)
CWE-20 Improper Input Validation
CWE-94 Improper Control of Generation of Code ('Code Injection')
System Score Found at
cvssv3.1 8.8 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-w3w2-mpp5-92gm/GHSA-w3w2-mpp5-92gm.json
generic_textual HIGH
Reference id Reference type URL
https://activemq.apache.org/security-advisories.data/CVE-2026-34197-announcement.txt
https://github.com/apache/activemq
CVE-2026-40466 https://nvd.nist.gov/vuln/detail/CVE-2026-40466
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-w3w2-mpp5-92gm/GHSA-w3w2-mpp5-92gm.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-04-27T13:37:05Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/40xxx/CVE-2026-40466.json

Source Advisory: vulnrichment/CVE-2026-40466

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]

Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-04-27T13:37:05Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/40xxx/CVE-2026-40466.json

Source Advisory: vulnrichment/CVE-2026-40466

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'total'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]