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Vulnerabilities

Vulnerability · CVE-2026-67239

RabbitMQ: Stored XSS via TLS peer-certificate DN in stream-management UI

Published Oct 1, 2026 · catalog updated Oct 17, 2026 · Canonical Ubuntu

Check if you run it

No confirmed exploitation is on record for CVE-2026-67239. EPSS is 0.16%. Act only if a listed version of Canonical Ubuntu is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.16%
Remediation
Advisory link
Affected products
Bitnami rabbitmq

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 ( ). 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Bitnami rabbitmq3.13.0 → 3.13.18

How to fix CVE-2026-67239

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-67239. EPSS is 0.16%. Act only if a listed version of Canonical Ubuntu is installed.

Which versions are affected?

Compare what you have installed with 3.13.0 → 3.13.18. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.16%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2026 · Ubuntu Security Notices

    Detected

    CVE-2026-67239 is listed by USN-8933-1: RabbitMQ Server vulnerabilities.

  2. Oct 17, 2026 · GitHub Advisory Database

    Fix available

    rabbitmq fixed in 3.13.18

  3. Oct 17, 2026 · GitHub Advisory Database

    Fix available

    rabbitmq fixed in 3.13.18

  4. Oct 17, 2026 · GitHub Advisory Database

    Updated

    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 ( ). Requires non-default config: a stream TLS listener w

Sources

  • CVE.orgVulnerability recordCVE-2026-67239

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-67239

    30-day exploitation probability 0.2%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-xm9p-57xv-vxwc

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • OpenSSF OSV / OSV ScannerPackage advisoryBIT-rabbitmq-2026-67239

    RabbitMQ: Stored XSS via TLS peer-certificate DN in stream-management UI

    osv.dev
  • Ubuntu Security NoticesVendor advisoryCVE-2026-67239

    It was discovered that RabbitMQ Server incorrectly handled CORS wildcard origin configuration. An attacker could possibly use this issue to cause a cross-site request forgery attack. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS,

    ubuntu.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.