CVE-2026-57967: Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session reattachment
CVE-2026-57967: unauthenticated attackers can hijack authenticated ActiveMQ Artemis sessions via crafted CORE protocol SESSION_REATTACH packets.
An unauthenticated remote attacker can craft a CORE protocol SESSION_REATTACH packet to steal an existing session and assume ongoing execution of the previously authenticated session on Apache Artemis and ActiveMQ Artemis. Affected versions are artemis-server 2.50.0 through 2.56.0 in Apache Artemis and artemis-server 1.0.0 through 2.44.0 in Apache ActiveMQ Artemis. Apache rates the issue important.