CVE-2026-49363Network attack vector

Pre-auth cluster topology disclosure via subscription

Published Sep 10, 2026 · Updated Sep 10, 2026

Missing authentication in Apache Artemis 2.50.0 through 2.56.0 lets remote attackers read cluster node details before login. The CORE protocol handler accepts a SUBSCRIBE_TOPOLOGY request before validating the connection and returns the broker cluster's topology. The same behavior affects Apache ActiveMQ Artemis 1.0.0 through 2.44.0; reachability requires an exposed CORE protocol endpoint, and the consequence is limited to disclosure of cluster node details.

CVSS severityUnavailable
Unscored
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Apache Artemis 2.50.0 through 2.56.0 lets remote attackers read cluster node details before login. The CORE protocol handler accepts a SUBSCRIBE_TOPOLOGY request before validating the connection and returns the broker cluster's topology. The same behavior affects Apache ActiveMQ Artemis 1.0.0 through 2.44.0; reachability requires an exposed CORE protocol endpoint, and the consequence is limited to disclosure of cluster node details.

The record

CVE
CVE-2026-49363
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
The Apache Software Foundation
Product
Apache Artemis
Classifications
CWE-306, T1018
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=1.0.0 <=2.44.0
  2. Affected versionversion=2.50.0 <=2.56.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Artemisversion=1.0.0 <=2.44.0; version=2.50.0 <=2.56.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1018Remote System Discovery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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