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9.8

Apache Artemis and ActiveMQ Artemis let attacker hijack sessions

CVE-2026-57967 · published 15 days ago
Summary

Versions of Apache Artemis (2.50.0‑2.56.0) and ActiveMQ Artemis (1.0.0‑2.44.0) can be tricked into letting someone take over an existing user session without logging in. This would let the attacker act as the legitimate user and access any data or actions that user is allowed to. Upgrade the software to the latest release (2.57.0 or newer) to close the gap.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
apache software foundation apache artemis <= 2.56.0
apache software foundation apache activemq artemis <= 2.44.0
apache artemis >= 1.0.0, < 2.44.0
>= 2.50.0, < 2.57.0
cpe:2.3:a:apache:artemis:*:*:*:*:*:*:*:*
Original advisory text
Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session reattachment
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.
References
Severity
9.8 Critical
Exploitation
EPSS 1%
Type
CWE-306Missing Authentication for Critical Function
Timeline
Published10 Sep 2026
Updated25 Sep 2026
First seen10 Sep 2026
Sources
CVE-2026-57967 · NVD
CVE-2026-57967 · MITRE
CVE-2026-57967 · OSV
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