What is CVE-2026-44839?

CVE-2026-44839 is a medium-severity vulnerability in Broadcom Rabbitmq Server, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 4.8/10. Published 2026-05-27.

How severe is CVE-2026-44839?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Broadcom Rabbitmq Server

CVE-2026-44839

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.

Published 2026-05-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (7.2th percentile), scored 2026-10-22.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Broadcom Rabbitmq Server
Rabbitmq Rabbitmq-Server — versions >= 3.7.0, < 4.0.13, >= 4.1.0-alpha, < 4.1.2

Weakness classification (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

References

github.com/rabbitmq/rabbitmq-server/commit/7f54319279d1ece161ae0b4cdc6f0e58a404… (Patch)
github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-fh5r-jpm3-fjwp (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44839?: CVE-2026-44839 is a medium-severity vulnerability in Broadcom Rabbitmq Server, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 4.8/10. Published 2026-05-27.
How severe is CVE-2026-44839?: Medium severity. CVSS v3 base score is 4.8 out of 10.