Stored cross-site scripting in RabbitMQ Server - CVE-2026-44839
Published: May 6, 2026 / Updated: June 1, 2026
Vulnerability identifier: #VU130270
CSH Severity: Medium
CVSS v4: 1.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-44839
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper neutralization of script-related html tags in a web page in the management UI pages that list virtual hosts when rendering unsanitized virtual host names in restart forms. A remote privileged user can create a crafted virtual host name and force the virtual host to restart to disclose sensitive information.
User interaction is required because a victim must visit the page of the malicious virtual host.
Affected software
RabbitMQ Server
Fedora
rabbitmq-server
Fedora
rabbitmq-server
How to mitigate CVE-2026-44839
Install security update from vendor's website.
RabbitMQ Server - update to 4.1.2
rabbitmq-server - addressed in versions 4.0.9-4.fc43, 4.0.9-5.fc43, 4.2.9-1.fc44
rabbitmq-server - addressed in versions 4.0.9-4.fc43, 4.0.9-5.fc43, 4.2.9-1.fc44