# CVE-2026-27446: Apache ActiveMQ Artemis authentication bypass in Core protocol

Source: https://junglewise.ai/threats/cve-2026-27446-apache-activemq-artemis-authentication-bypass-in-core-protocol  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-04. Updated: 2026-06-15  
License: CC BY 4.0 with a link back

CVE-2026-27446 · Severity: critical · CVSS 9.8 · Published 2026-03-04

Apache ActiveMQ Artemis, a popular open-source message broker used for high-performance messaging, is vulnerable to an authentication bypass. An unauthenticated attacker can trick the system into connecting to a malicious server, allowing them to steal sensitive messages or inject fraudulent data into the system's queues. This could lead to significant data breaches or the disruption of business-critical automated workflows.

Technologies: [Apache Activemq Artemis](https://junglewise.ai/threats/technologies/activemq-artemis), [Apache Artemis](https://junglewise.ai/threats/technologies/artemis), [org.apache.activemq:artemis-server (Maven)](https://junglewise.ai/threats/technologies/org-apache-activemq-artemis-server). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache), [Maven](https://junglewise.ai/threats/vendors/maven), [Siemens](https://junglewise.ai/threats/vendors/siemens).

## Quick answers

**Is CVE-2026-27446 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-27446 being exploited in the wild.

**How severe is CVE-2026-27446?** Critical severity, with a CVSS score of 9.8, published 4 March 2026.

**Which products and versions are affected?** Apache Artemis 2.50.0 - 2.51.0, 2.50.0 through 2.51.0; org.apache.activemq:artemis-server (Maven) >= 2.11.0, <= 2.44.0, ECOSYSTEM:introduced=2.11.0,last_affected=2.44.0; org.apache.artemis:artemis-server (Maven) >= 2.50.0, < 2.52.0, ECOSYSTEM:introduced=2.50.0,fixed=2.52.0; Siemens Opcenter RD&L All versions.

**Is there a fix for CVE-2026-27446?** Yes. org.apache.artemis:artemis-server (Maven): upgrade to 2.52.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-27446 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-27446?** Check whether you run Apache Activemq Artemis, Apache Artemis, org.apache.activemq:artemis-server (Maven) or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- org.apache.artemis:artemis-server (Maven): upgrade to 2.52.0 or later

  ```sh
  # set org.apache.artemis:artemis-server to 2.52.0 in your pom.xml or build.gradle
  ```


## Technical details

A Missing Authentication for Critical Function (CWE-306) vulnerability exists in the Core protocol implementation of Apache Artemis and ActiveMQ Artemis. An unauthenticated remote attacker can send specific Core protocol packets to force the target broker to initiate an outbound Core federation connection to an attacker-controlled rogue broker. Once the federation is established, the attacker can exfiltrate messages from any queue or inject arbitrary messages into the system. The vulnerability is exploitable if the broker accepts incoming Core protocol connections from untrusted sources and is permitted to make outgoing Core connections. Mitigation involves upgrading to version 2.52.0, implementing two-way SSL, or using Core interceptors to block downstream federation connect packets (type -16).

## Affected products

- Apache Artemis 2.50.0 through 2.51.0
- Apache ActiveMQ Artemis 2.11.0 through 2.44.0
- Siemens Opcenter RDnL All versions using affected Apache Artemis versions

## Identifiers

- CVE-2026-27446
- GHSA-fw88-pf9m-p947

## Timeline

- 2026-03-03: disclosed: Initial disclosure on oss-security mailing list
- 2026-03-04: advisory: NVD publication date
- 2026-05-12: advisory: Siemens published downstream advisory SSA-085541 for Opcenter RDnL

## References

- [https://lists.apache.org/thread/jwpsdc8tdxotm98od8n8n30fqlzoc8gg](https://lists.apache.org/thread/jwpsdc8tdxotm98od8n8n30fqlzoc8gg)
- [http://www.openwall.com/lists/oss-security/2026/03/03/4](http://www.openwall.com/lists/oss-security/2026/03/03/4)
- [http://www.openwall.com/lists/oss-security/2026/03/04/1](http://www.openwall.com/lists/oss-security/2026/03/04/1)
- [https://cert-portal.siemens.com/productcert/html/ssa-085541.html](https://cert-portal.siemens.com/productcert/html/ssa-085541.html)

## Related threats

- [Apache ActiveMQ Artemis unsafe reflection in federation](https://junglewise.ai/threats/cve-2026-101292-apache-activemq-artemis-before-2-34-0-contains-an-unsafe)
- [Apache ActiveMQ Artemis denial of service via crafted wildcard selector](https://junglewise.ai/threats/cve-2026-75880-apache-activemq-artemis-denial-of-service-via-crafted-wildcard)
- [Apache Artemis Openwire RemoveSubscriptionInfo unauthenticated queue deletion](https://junglewise.ai/threats/cve-2026-67593-apache-artemis-openwire-removesubscriptioninfo-unauthenticated)
- [Apache Artemis CORE protocol session reattach authentication bypass](https://junglewise.ai/threats/cve-2026-57967-apache-artemis-core-protocol-session-reattach-authentication)
- [Apache Artemis Java deserialization denial of service in message management](https://junglewise.ai/threats/cve-2026-57822-apache-artemis-java-deserialization-denial-of-service-in-message)