CVE-2026-44839 RabbitMQ: Unsanitized vhost names allow for XSS in management UI
Attackers can inject malicious scripts via unsanitized vhost names in the RabbitMQ management UI, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-44839?
CVE-2026-44839 is a medium-severity cross-site scripting vulnerability in Broadcom Rabbitmq Server, published on 27 May 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
RabbitMQ is a messaging and streaming broker. From 3.7.0 to before 4.1.2 and 4.0.13, This vulnerability is fixed in 4.1.2 and 4.0.13.
Weakness: CWE-80
Which versions are affected by CVE-2026-44839?
1 open source package ship an affected version, including rabbitmq. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
rabbitmq Bitnami | From 3.7.0 | 4.0.13, 4.1.2 |
Products include Broadcom Rabbitmq Server.
How do I fix CVE-2026-44839?
Upgrade rabbitmq to a fixed version for your release line: 4.0.13 or 4.1.2.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-44839 being exploited?
There is no known exploitation of CVE-2026-44839 in the wild and no public exploit code.
Other vulnerabilities in Broadcom Rabbitmq Server
- CVE-2016-9877 Auth bypass in Pivotal RabbitMQ 3.x before 3.5.8 and 3.6.x before 3.6.6; RabbitMQ for PCF 1.5.x before 1.5.20, 1.6.x before 1.6.12 and 1.7.x before 1.7.7
- CVE-2026-67404 RabbitMQ: OAuth2 silent verify_none fallback for JWKS fetch
- CVE-2026-67231 RabbitMQ: Trust-store whitelist by Issuer+Serial only
- CVE-2026-57219 Information disclosure in rabbitmq-server
- CVE-2026-67236 RabbitMQ: Plaintext username:password stored in an insecure cookie after successful POST /login
Sources
Also known as AZL-89289, BIT-rabbitmq-2026-44839, DEBIAN-CVE-2026-44839, GHSA-fh5r-jpm3-fjwp, UBUNTU-CVE-2026-44839.