Vulnerability · Published Sep 10, 2026 · Assigned by apache
CVE-2026-57967Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session reattachment
Critical 9.8
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 1.5% (higher than 74% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
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. This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. Users are recommended to upgrade to version 2.57.0, which fixes the issue.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache Artemis | 2.50.0 – through 2.56.0 |
| Apache Software Foundation | Apache ActiveMQ Artemis | 1.0.0 – 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:H