Auth bypass in Broadcom Rabbitmq_server
CVE-2026-44838
RabbitMQ is a messaging and streaming broker. From 4.2.0 to before 4.2.4, RabbitMQ's MQTT plugin allows for topic-level authorization using regular expressions with variable substitution. Administrators can create patterns such as ^{client…
Vulnerability class: Broken Access Control
EPSS: 0.000 (13.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Broadcom Rabbitmq_server
- Rabbitmq Rabbitmq-server — versions >= 4.2.0, < 4.2.4
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44838?
- CVE-2026-44838 is a high-severity vulnerability in Broadcom Rabbitmq_server, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2026-05-27.
- How severe is CVE-2026-44838?
- High severity. CVSS v3 base score is 8.1 out of 10.