What is CVE-2026-49364?

CVE-2026-49364 is a critical-severity vulnerability in Apache Artemis, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-09-10.

How severe is CVE-2026-49364?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Apache Artemis

CVE-2026-49364

An unauthenticated network-adjacent attacker can leverage discovery to capture cluster administrative credentials during the initial cluster connection handshake. 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.

Vulnerability class: Broken Authentication

Published 2026-09-10 · last modified 2026-09-16.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.3th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

lists.apache.org/thread/4qbgcz3k38q30bfbf7hphtomrdc8l8n8 (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-49364?: CVE-2026-49364 is a critical-severity vulnerability in Apache Artemis, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-09-10.
How severe is CVE-2026-49364?: Critical severity. CVSS v3 base score is 9.1 out of 10.