CVE-2026-27446: Missing Auth on Core Protocol in Apache Artemis 2.50.0-2.51.0
CVE-2026-27446 Published on March 4, 2026

Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation
Missing Authentication for Critical Function (CWE-306) vulnerability in Apache Artemis, Apache ActiveMQ Artemis. An unauthenticated remote attacker can use the Core protocol to force a target broker to establish an outbound Core federation connection to an attacker-controlled rogue broker. This could potentially result in message injection into any queue and/or message exfiltration from any queue via the rogue broker. This impacts environments that allow both: - incoming Core protocol connections from untrusted sources to the broker - outgoing Core protocol connections from the broker to untrusted targets This issue affects: - Apache Artemis from 2.50.0 through 2.51.0 - Apache ActiveMQ Artemis from 2.11.0 through 2.44.0. Users are recommended to upgrade to Apache Artemis version 2.52.0, which fixes the issue. The issue can be mitigated by one of the following: - Remove Core protocol support from any acceptor receiving connections from untrusted sources. Incoming Core protocol connections are supported by default via the "artemis" acceptor listening on port 61616. See the "protocols" URL parameter configured for the acceptor. An acceptor URL without this parameter supports all protocols by default, including Core. - Use two-way SSL (i.e. certificate-based authentication) in order to force every client to present the proper SSL certificate when establishing a connection before any message protocol handshake is attempted. This will prevent unauthenticated exploitation of this vulnerability. - Implement and deploy a Core interceptor to deny all Core downstream federation connect packets. Such packets have a type of (int) -16 or (byte) 0xfffffff0. Documentation for interceptors is available at  https://artemis.apache.org/components/artemis/documentation/latest/intercepting-operations.html .

Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-27446 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Type

Missing Authentication for Critical Function

The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.


Products Associated with CVE-2026-27446

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-27446 are published in these products:

Apache Activemq Artemis
 
Red Hat Jboss Enterprise Application Platform
 
Red Hat Amq Broker
 
Red Hat Apache Camel Spring Boot
 
Red Hat Optaplanner
 
Red Hat Jboss Fuse
 
Red Hat Jboss Enterprise Bpms Platform
 
Red Hat Amq Clients
 
Red Hat Jbosseapxp
 
Red Hat Openshift Devspaces
 
Red Hat Satellite
 
Red Hat Single Sign On
 

Affected Versions

Apache Software Foundation Apache Artemis: Apache Software Foundation Apache ActiveMQ Artemis: Siemens Opcenter RDnL: Red Hat JBoss EAP 8.1 for RHEL 8: Red Hat JBoss EAP 8.1 for RHEL 9: Red Hat AMQ Broker 7.12.6: Red Hat AMQ Broker 7.13.4: Red Hat JBoss Enterprise Application Platform 8.1: Red Hat build of Apache Camel 4.18.1 for Spring Boot 3.5.14: Red Hat build of OptaPlanner 8: Red Hat Fuse 7: Red Hat JBoss Enterprise Application Platform 7: Red Hat Process Automation 7: Red Hat AMQ Clients: Red Hat JBoss Enterprise Application Platform Expansion Pack: Red Hat OpenShift Dev Spaces: Red Hat Satellite 6: Red Hat Single Sign-On 7:

Exploit Probability

EPSS
8.34%
Percentile
94.24%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.