CVE-2026-67411

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Source
https://cve.org/CVERecord?id=CVE-2026-67411
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67411.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-67411
Aliases
  • GHSA-4r6f-9cpw-f6g6
Downstream
Published
2026-09-25T16:26:33Z
Modified
2026-09-27T03:47:36Z
Severity
  • 6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass
Details

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3, native MQTT and MQTT over WebSocket behind a trusted PROXY Protocol frontend could lose the proxy-derived client address before the MQTT authentication path checked loopback_users, causing the frontend-to-broker address to be treated as loopback. An attacker who can reach the trusted frontend and has valid credentials for a loopback-restricted account can therefore bypass the source-address restriction; the issue does not bypass password authentication. This issue is fixed in versions 3.13.18, 4.0.23, 4.1.14, 4.2.9, and 4.3.3.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-863"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67411.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "4.1.0"
                },
                {
                    "fixed":  "4.1.14"
                },
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.0.23"
                },
                {
                    "introduced":  "3.13.0"
                },
                {
                    "fixed":  "3.13.18"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/rabbitmq/rabbitmq-server

Affected ranges

Type
GIT
Repo
https://github.com/rabbitmq/rabbitmq-server
Events
Introduced
1929eeadf9b2bac12c5434fb56884ef27370580e
Introduced
95c501fbad76c66156346cf364d158d6e30aa4d9
Fixed
1d284b2d2a1e2f845ad22b0d5ee38ec372d50802
Fixed
47d6d6457c7d1a440daed643cb7d76bba313e79c
Fixed
a7528314840c4f8dc9904684f9f97ffa7aac6349
Fixed
edbead0eabbd65925d0dc914a22d6a29e155e646
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "4.3.0"
        },
        {
            "fixed":  "4.3.3"
        },
        {
            "introduced":  "4.2.0"
        },
        {
            "fixed":  "4.2.9"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v4.*
v4.2.0
v4.2.1
v4.2.2
v4.2.3
v4.2.4
v4.2.5
v4.2.6
v4.2.7
v4.2.8
v4.3.0
v4.3.1
v4.3.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67411.json"