SB2026050694 - Stored XSS in RabbitMQ management UI

Description

This security bulletin contains information about 1 vulnerability.

1) Stored cross-site scripting (CVE-ID: CVE-2026-44839)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 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/E:U/U:Green

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.

Remediation

Install update from vendor's website.

References

• https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-fh5r-jpm3-fjwp
• https://github.com/rabbitmq/rabbitmq-server/commit/7f54319279d1ece161ae0b4cdc6f0e58a4045eb5