Re: CVE-2026-27446: Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation

[Yogesh Mittal <ymittal () redhat com>]

Hi Justin

I noticed that the cve.org link provided at the bottom of your email still
shows the CVE status as 'Reserved'. Could you please publish the CVE
details there as soon as possible?

Thanks and regards,

Yogesh Mittal

Manager, Product Security Vulnerability Management

Red Hat Pune <https://www.redhat.com/>

ymittal () redhat com
M: +91-9637123455


<https://www.redhat.com/>


On Tue, Mar 3, 2026 at 10:58 PM Justin Bertram <jbertram () apache org> wrote:

> Severity: critical
>
> Affected versions:
>
> - Apache Artemis (org.apache.artemis:artemis-server) 2.50.0 through 2.51.0
> - Apache ActiveMQ Artemis (org.apache.activemq:artemis-server) 2.11.0
> through 2.44.0
>
> Description:
>
> 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 either 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.
>
> Credit:
>
> Hardik Mehta <mehtahardik () proton me> (finder)
>
> References:
>
> https://artemis.apache.org
> https://www.cve.org/CVERecord?id=CVE-2026-27446