Is CVE-2026-57967 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-57967 being exploited in the wild.

How severe is CVE-2026-57967?

Critical severity, with a CVSS score of 9.8, published 10 September 2026.

Which products and versions are affected?

Apache Activemq Artemis 1.0.0 through 2.44.0; Apache Artemis 2.50.0 through 2.56.0.

Is there a fix for CVE-2026-57967?

A patch was published on 2026-09-10: Fix available in Apache Artemis 2.57.0 and ActiveMQ Artemis 2.45.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-57967 attacked?

It is attacked over the network.

Am I affected by CVE-2026-57967?

Check whether you run Apache Activemq Artemis or Apache Artemis at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-57967: Apache Artemis CORE protocol session reattach authentication bypass

CVE-2026-57967 · Severity: critical · CVSS 9.8 · Published 2026-09-10

Apache Artemis is a widely-used open-source message broker that handles enterprise messaging for business applications. An unauthenticated attacker on the network can exploit a flaw in the CORE protocol to hijack an existing authenticated session, effectively taking over an active client connection and gaining unauthorized access to the message broker's functionality and data.

Technologies: Apache Activemq Artemis, Apache Artemis. Vendors: Apache.

Quick answers

Is CVE-2026-57967 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-57967 being exploited in the wild.
How severe is CVE-2026-57967?: Critical severity, with a CVSS score of 9.8, published 10 September 2026.
Which products and versions are affected?: Apache Activemq Artemis 1.0.0 through 2.44.0; Apache Artemis 2.50.0 through 2.56.0.
Is there a fix for CVE-2026-57967?: A patch was published on 2026-09-10: Fix available in Apache Artemis 2.57.0 and ActiveMQ Artemis 2.45.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-57967 attacked?: It is attacked over the network.
Am I affected by CVE-2026-57967?: Check whether you run Apache Activemq Artemis or Apache Artemis at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a session hijacking / authentication bypass in Apache Artemis's CORE protocol implementation. An unauthenticated remote attacker can craft a malicious SESSION_REATTACH packet to steal and assume control of an existing authenticated session. The attack requires network access to the CORE protocol port but no prior authentication credentials. Once exploited, the attacker gains full execution privileges of the compromised session, allowing them to perform any action the hijacked authenticated client is authorized to perform. Upgrade to Apache Artemis 2.57.0 or Apache ActiveMQ Artemis 2.45.0 or later to remediate.

Affected products

Apache Artemis 2.50.0 through 2.56.0
Apache ActiveMQ Artemis 1.0.0 through 2.44.0

Timeline

2026-09-10: disclosed: CVE-2026-57967 published
2026-09-10: patched: Fix available in Apache Artemis 2.57.0 and ActiveMQ Artemis 2.45.0

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.