# CVE-2026-57967: Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session reattachment

> Unauthenticated attackers can hijack active sessions via crafted CORE protocol packets, leading to unauthorized access and potential code execution.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Sep 2026
- **Updated:** 9 Oct 2026
- **Also known as:** GHSA-735c-72gw-5q97

## What is CVE-2026-57967?

CVE-2026-57967 is a critical authentication bypass vulnerability in Apache ActiveMQ Artemis, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-57967?

It affects 1 product.


Products: Apache Artemis.

## How do I fix CVE-2026-57967?

Upgrade to a fixed version.

## Is CVE-2026-57967 being exploited?

There is no known exploitation of CVE-2026-57967 in the wild and no public exploit code.

Public exploit code:

- CVE-2026-57967 PoC — Apache ActiveMQ Artemis unauthenticated session hijacking via SESSION_REATTACH (2.50.0–2.56.0) (github_poc): https://github.com/c0dem4sters/CVE-2026-57967

## Other vulnerabilities in Apache ActiveMQ Artemis

- [CVE-2026-27446](https://insights.sbomify.com/CVE-2026-27446/): Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation (critical 9.3)
- [CVE-2026-49364](https://insights.sbomify.com/CVE-2026-49364/): Information disclosure in Apache ActiveMQ Artemis (critical 9.1)
- [CVE-2026-67593](https://insights.sbomify.com/CVE-2026-67593/): Missing authorization in Apache ActiveMQ Artemis (critical 9.1)
- [CVE-2023-50780](https://insights.sbomify.com/CVE-2023-50780/): Apache ActiveMQ Artemis: Authenticated users could perform RCE via Jolokia MBeans (high 8.8)
- [CVE-2026-49362](https://insights.sbomify.com/CVE-2026-49362/): Missing authorization in Apache ActiveMQ Artemis (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57967 and fix it if it is affected.

What it is: CVE-2026-57967 is a critical authentication bypass vulnerability in Apache ActiveMQ Artemis, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-57967 in the wild and no public exploit code.

Affected product: Apache ActiveMQ Artemis. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-57967/ (Markdown: https://insights.sbomify.com/CVE-2026-57967/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57967
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57967
- OSV: https://osv.dev/vulnerability/CVE-2026-57967

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57967/
Summaries are generated and may contain mistakes; the official description above is the record.