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CVE-2026-27446 is a missing-authentication vulnerability in the Core downstream federation handler of Apache Artemis 2.50.0–2.51.0 and Apache ActiveMQ Artemis 2.11.0–2.44.0. An unauthenticated remote attacker can submit a federation connection packet that causes the target broker to establish an outbound Core federation connection to an attacker-controlled broker. The rogue broker can potentially inject messages into any queue or exfiltrate messages from any queue. Exploitation requires both inbound Core connections from untrusted sources and outbound Core connections to untrusted destinations.
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A critical missing-authentication vulnerability affecting Apache Artemis 2.50.0–2.51.0 and Apache ActiveMQ Artemis 2.11.0–2.44.0. Exploitation requires the broker to accept incoming Core protocol connections from untrusted sources and permit outgoing Core connections to untrusted targets. An unauthenticated attacker could force federation with a rogue broker, potentially enabling message injection or exfiltration. The reported CVSS v3 base score is 9.8. Apache Artemis 2.52.0 fixes the issue. Mitigations include disabling Core on untrusted-facing acceptors, requiring mutual TLS, or deploying a Core interceptor that blocks downstream federation connection packets.
An authentication-bypass issue in the Apache ActiveMQ Artemis federation handler, distinct from the primary pre-auth topology-disclosure issue described in this reference.
An authentication/access-control vulnerability affecting Apache ActiveMQ Artemis federation-peer access. If unpatched, it makes the separately described SSRF and connector-injection condition reachable without authentication.
An existing CVE referenced as a condition that can make the separate Apache ActiveMQ Artemis federation reflection defect reachable before authentication. The content does not describe the vulnerability itself.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.