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Vulnerability · Published Mar 4, 2026 · Assigned by apache

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

Critical 9.1

In plain English

A critical-severity missing authentication in Apache ActiveMQ Artemis from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 11.4% (higher than 96% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)11.4%top 4.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 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 .

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.apache.activemq:artemis-serverno fix listedGHSA-fw88-pf9m-p947
Mavenorg.apache.artemis:artemis-server2.52.0GHSA-fw88-pf9m-p947
Ubuntu:24.04:LTSactivemqno fix listedUBUNTU-CVE-2026-27446
Ubuntu:25.10activemqno fix listedUBUNTU-CVE-2026-27446
Ubuntu:26.04:LTSactivemqno fix listedUBUNTU-CVE-2026-27446
Ubuntu:26.10activemqno fix listedUBUNTU-CVE-2026-27446

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache Artemis 2.50.0 – through 2.51.0
Apache Software Foundation Apache ActiveMQ Artemis 2.11.0 – through 2.44.0

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References