Vulnerability · Published Sep 25, 2026 · Assigned by GitHub_M
CVE-2026-67239RabbitMQ: Stored XSS via TLS peer-certificate DN in stream-management UI
High 7.6
In plain English
A high-severity cross-site scripting in rabbitmq-server from rabbitmq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rabbitmq-server | no fix listed | DEBIAN-CVE-2026-67239 |
| Debian:13 | rabbitmq-server | no fix listed | DEBIAN-CVE-2026-67239 |
| Debian:14 | rabbitmq-server | 4.3.6-1 | DEBIAN-CVE-2026-67239 |
| Ubuntu:22.04:LTS | rabbitmq-server | 3.9.27-0ubuntu0.6 | UBUNTU-CVE-2026-67239 |
| Ubuntu:22.04:LTS | rabbitmq-server | 3.9.27-0ubuntu0.6 | USN-8933-1 |
| Ubuntu:24.04:LTS | rabbitmq-server | 3.12.1-1ubuntu1.7 | USN-8933-1 |
| Ubuntu:24.04:LTS | rabbitmq-server | 3.12.1-1ubuntu1.7 | UBUNTU-CVE-2026-67239 |
| Ubuntu:26.04:LTS | rabbitmq-server | 4.0.5-10ubuntu5.2 | USN-8933-1 |
| Ubuntu:26.04:LTS | rabbitmq-server | 4.0.5-10ubuntu5.2 | UBUNTU-CVE-2026-67239 |
| Ubuntu:26.10 | rabbitmq-server | no fix listed | UBUNTU-CVE-2026-67239 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| rabbitmq | rabbitmq-server | >= 3.13.0, < 3.13.18>= 4.0.0, < 4.0.23>= 4.1.0, < 4.1.14>= 4.2.0, < 4.2.9>= 4.3.0, < 4.3.3 |
Weakness: CWE-79 · 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
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-xm9p-57xv-vxwc x_refsource_CONFIRM
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9 x_refsource_MISC
- https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3 x_refsource_MISC