# 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-44839
- Priority: Routine
- CVSS: 4.8 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 27, 2026
- Weakness: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44839

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | rabbitmq-server Debian 14 | 4.3.0-2 | [DEBIAN-CVE-2026-44839](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44839.md) | Jun 24, 2026 |
| Linux | rabbitmq-server Fedora 43 | 4.0.9-5.fc43 | [FEDORA-2026-548235EA3B](https://patchblox.com/security/data/fix/linux/fedora-2026-548235ea3b.md) | Jul 30, 2026 |
| Linux | rabbitmq-server opensuse-leap 16.0 | 4.1.5-160000.2.1 | [OPENSUSE-SU-2026:21903-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21903-1.md) | Sep 22, 2026 |
| Linux | rabbitmq-server sles 16.0 | 4.1.5-160000.2.1 | [SUSE-SU-2026:23869-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23869-1.md) | Sep 22, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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