CVE-2026-4649 Auth bypass in Apache Artemis allows reading all internal messages
Authenticated users can bypass authentication to read and inject internal messages in KNIME Business Hub via Apache Artemis.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4649?
CVE-2026-4649 is a medium-severity authentication bypass vulnerability in KNIME Business Hub, published on 24 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Apache Artemis before version 2.52.0 is affected by an authentication bypass flaw which allows reading all messages exchanged via the broker and injection of new message ( CVE-2026-27446 https://www.cve.org/CVERecord ). Since KNIME Business Hub uses Apache Artemis it is also affected by the issue. However, since Apache Artemis is not exposed to the outside it requires at least normal user privileges and the ability to execute workflows in an executor. Such a user can install and register a federated mirror without authentication to the original Apache Artemis instance and thereby read all internal messages and inject new messages.
The issue affects all versions of KNIME Business Hub. A fixed version of Apache Artemis is shipped with versions 1.18.0, 1.17.4, and 1.16.3.
We recommend updating to a fixed version as soon as possible since no workaround is known.
Weakness: CWE-306
Which versions are affected by CVE-2026-4649?
How do I fix CVE-2026-4649?
No fix has been published for CVE-2026-4649 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-4649 being exploited?
There is no known exploitation of CVE-2026-4649 in the wild and no public exploit code.
Sources
Also known as GHSA-c27m-9j97-3ghp, UBUNTU-CVE-2026-4649.