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9.1
CVE-2026-67239: RabbitMQ stream UI may show attacker‑controlled certificate info
CVE-2026-67239 · published 2 days ago
Summary
If RabbitMQ is set up with a TLS listener that checks client certificates, the stream‑management web page displays the certificate subject and issuer without cleaning the data. An attacker who can supply a trusted certificate could inject malicious code that runs when an operator views the page. Update RabbitMQ to the latest patched release or disable the vulnerable UI to resolve the issue.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| – | rabbitmq | rabbitmq-server | >= 3.13.0, < 3.13.18 |
| Debian:12 | debian | rabbitmq-server | All versions |
Original advisory text
RabbitMQ: Stored XSS via TLS peer-certificate DN in stream-management UI
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.
References
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-xm9p-57xv-v... Vendor Advisory
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 URL
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 URL
- https://security-tracker.debian.org/tracker/CVE-2026-67239 Vendor Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67239... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-67239 Vendor Advisory
Severity
9.1
Critical
Exploitation
EPSS <1%
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published25 Sep 2026
Updated27 Sep 2026
First seen25 Sep 2026
Sources
CVE-2026-67239 · NVD
CVE-2026-67239 · MITRE
DEBIAN-CVE-2026-67239 · OSV
CVE-2026-67239 · OSV
GHSA-xm9p-57xv-vxwc · GHSA
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