Medium severity · published Sep 23, 2026
CVE-2026-66075
RabbitMQ: Monitoring-tag user can restart federation links
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.1, is_authorized/2 for the /federation-links/.../restart route uses is_authorized_monitor (accepts the monitoring tag), while allowed_methods permits DELETE and delete_resource/2 triggers rabbit_federation_link_sup:restart. There is no per-method elevation check and no comment marking it intentional. A read-only monitoring user can restart any federation link , a state-changing operation that disrupts message flow. Preconditions include rabbitmq_federation + rabbitmq_federation_management plugins enabled Attacker has credentials with the monitoring tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.1.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 13% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RA
rabbitmq-server · rabbitmq
>= 3.13.0, < 3.13.15; >= 4.0.0, < 4.0.20; >= 4.1.0, < 4.1.11; >= 4.2.0, < 4.2.6; >= 4.3.0, < 4.3.1 · source: vendor
RS
Rabbitmq Server · Broadcom
3.13.0 before 3.13.15; 4.0.0 before 4.0.20; 4.1.0 before 4.1.11; 4.2.0 before 4.2.6; 4.3.0 before 4.3.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66075
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66075
Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6
Release Notes
https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1
Vendor Advisory
https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-g5v3-w5xg-62q2
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