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CVE Record

CVE-2026-40466: Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Possible bypass of CVE-2026-34197 via HTTP discovery second-stage URI

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.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-40466 can let a logged-in attacker turn Apache ActiveMQ broker management access into code execution on the broker server. It is a bypass of an earlier fix and depends on Jolokia management exposure plus the activemq-http module being available. Apache recommends upgrading affected deployments.

Executive priority

Treat this as a high-priority server-side remediation for ActiveMQ environments. It can lead to code execution on messaging infrastructure, but available sources indicate authentication is required and do not confirm active exploitation.

Technical view

The issue affects Apache ActiveMQ Broker, All, and Apache ActiveMQ before 5.19.6, and 6.0.0 before 6.2.5. An authenticated attacker may bypass CVE-2026-34197 validation through HTTP Discovery transport, causing Spring ResourceXmlApplicationContext bean instantiation before BrokerService validation and resulting in JVM-level arbitrary code execution.

Likely exposure

Highest exposure is ActiveMQ brokers on vulnerable versions where Jolokia management actions are reachable by authenticated users and activemq-http is on the classpath. Internet-facing or broadly accessible broker management interfaces increase business urgency.

Exploitation context

The source bundle does not show KEV listing or confirmed active exploitation. The described path requires authentication, but the CVSS vector rates network attack complexity low with high confidentiality, integrity, and availability impact.

Researcher notes

Focus validation on version, Jolokia reachability, authenticated management permissions, and activemq-http presence. Evidence is limited to the published CVE data and linked advisories; no public exploit activity is established in the provided sources.

Mitigation direction

  • Upgrade Apache ActiveMQ to 5.19.6 or 6.2.5.
  • Prioritize brokers with reachable Jolokia management interfaces.
  • Restrict broker management access to trusted administrators while upgrading.
  • Check Apache and Red Hat guidance for environment-specific instructions.
  • Review whether activemq-http is present where it is not needed.

Validation and detection

  • Inventory ActiveMQ Broker, All, and Apache ActiveMQ package versions.
  • Confirm whether versions are before 5.19.6 or 6.0.0 through 6.2.4.
  • Identify brokers exposing Jolokia or remote management paths.
  • Check whether activemq-http is on the runtime classpath.
  • Verify upgraded systems report 5.19.6, 6.2.5, or later.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-20: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · medium confidence lookup

CWE-94: Code execution behavior lookup

Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-40466 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
5Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9CISA-ADP
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2026-40466Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPorg.apache.activemq/activemq-all: org.apache.activemq/activemq-broker: Apache ActiveMQ: Arbitrary code execution via improper input validation in HTTP Discovery transport
other:Red Hat severity ratingcvssV3_1
  • 2026-04-24T11:01:11.056Z: Reported to Red Hat.
  • 2026-04-24T10:15:44.445Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Apache Software FoundationApache ActiveMQ Brokerorg.apache.activemq:activemq-broker, 0, 6.0.0unaffected
Apache Software FoundationApache ActiveMQ Allorg.apache.activemq:activemq-all, 0, 6.0.0unaffected
Apache Software FoundationApache ActiveMQorg.apache.activemq:apache-activemq, 0, 6.0.0unaffected
Weakness

CWE details

CWE-20CWE-94

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.