---
title: "CVE-2026-67239\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-67239?format=md
keywords: index, follow
---

# CVE-2026-67239

Publication date 29 September 2026

Last updated 30 September 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

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## Description

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18 and
4.0.23 and 4.1.14 and 4.2.9 and 4.3.3, Stored XSS via TLS peer-certificate
DN in stream-management UI (sibling of V-11). lines 102/106/110 render
peercertsubject / peercertissuer with raw <%= %> and no fmtstring().
RFC4514 backslash-escaping of </> is HTML-inert and bypassable (<img ...
//>). Requires non-default config: a stream TLS listener with verifypeer
and an attacker-obtainable trusted cert with a malicious Same as the
connection.ejs finding, against operators viewing the stream-connection
detail rabbitmqstream + rabbitmqstreammanagement enabled with a TLS
listener using verifypeer Attacker can obtain a certificate signed by a CA
the listener trusts, with attacker-chosen DN An operator views the. This
issue is fixed in versions 3.13.18 and 4.0.23 and 4.1.14 and 4.2.9 and
4.3.3.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| rabbitmq-server | 26.04 LTS resolute | Needs evaluation |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v4.0

**Base score**

7.6 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | Present |
  | Privileges required | None |
  | User interaction | Passive |
  | Vulnerable system - Confidentiality impact | High |
  | Vulnerable system - Integrity impact | High |
  | Vulnerable system - Availability impact | None |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.6 · High |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-67239)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-67239)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-67239)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-67239)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-67239>
* <https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-xm9p-57xv-vxwc>
* <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9>
* <https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3>