CVE-2026-67411 RabbitMQ - Authentication Bypass

RabbitMQ 3.13.0 to 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3 contains an authentication bypass caused by loss of proxy-derived client address before loopback_users check in MQTT components, letting attackers with valid loopback-restricted credentials bypass source-address restrictions, exploit requires valid credentials for loopback-restricted account.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Required
EPSS
0.32% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Published
25 September 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Update to versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, or 4.3.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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