CVE-2026-27446

The record

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

Related vulnerabilities

• GHSA-fw88-pf9m-p947 Apache Artemis and Apache ActiveMQ Artemis are Missing Authentication for Critical… Same vulnerability
• CVE-2022-35278 In Apache ActiveMQ Artemis prior to 2.24.0, an attacker could show malicious content… Also affects org.apache.activemq:artemis-server
• CVE-2026-114636 Traefik v3.7.13 before v3.7.14 contains an access-control bypass in the Kubernetes… CWE-306
• CVE-2026-112104 A flaw has been found in eremef bandcamp-player up to 1.8.33-beta. CWE-306
• CVE-2026-53714 Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or… CWE-306
• CVE-2026-89261 MoguBlog through 6.2 exposes Elasticsearch index management endpoints in the mogu_search… CWE-306
• CVE-2026-89250 WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains an… CWE-306
• CVE-2026-89176 WeenyGenius, a computer lab management system developed by Howyar Technologies, has a… CWE-306