CVE-2026-44839

RabbitMQ: Unsanitized vhost names allow for XSS in management UI

CVE-2026-44839 is fixed in rabbitmq-server on 1 platform, first by DEBIAN-CVE-2026-44839, released June 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

4.8

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0018

7th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
rabbitmq-server · Debian 14	4.3.0-2	DEBIAN-CVE-2026-44839	Jun 24, 2026
rabbitmq-server · Fedora 43	4.0.9-5.fc43	FEDORA-2026-548235EA3B	Jul 30, 2026
rabbitmq-server · opensuse-leap 16.0	4.1.5-160000.2.1	OPENSUSE-SU-2026:21903-1	Sep 22, 2026
rabbitmq-server · sles 16.0	4.1.5-160000.2.1	SUSE-SU-2026:23869-1	Sep 22, 2026

Details

Published
May 27, 2026
Weakness
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44839

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