{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-67411",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-07-29T15:02:20.412Z",
        "datePublished": "2026-09-25T16:26:33.880Z",
        "dateUpdated": "2026-09-25T16:55:42.722Z"
    },
    "containers": {
        "cna": {
            "title": "RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-863",
                            "lang": "en",
                            "description": "CWE-863: Incorrect Authorization",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 6,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "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",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-4r6f-9cpw-f6g6",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-4r6f-9cpw-f6g6"
                },
                {
                    "name": "https://github.com/rabbitmq/rabbitmq-server/commit/a7528314840c4f8dc9904684f9f97ffa7aac6349",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/rabbitmq/rabbitmq-server/commit/a7528314840c4f8dc9904684f9f97ffa7aac6349"
                },
                {
                    "name": "https://github.com/rabbitmq/rabbitmq-server/commit/edbead0eabbd65925d0dc914a22d6a29e155e646",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/rabbitmq/rabbitmq-server/commit/edbead0eabbd65925d0dc914a22d6a29e155e646"
                },
                {
                    "name": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.9"
                },
                {
                    "name": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.3"
                }
            ],
            "affected": [
                {
                    "vendor": "rabbitmq",
                    "product": "rabbitmq-server",
                    "versions": [
                        {
                            "version": ">= 4.3.0, < 4.3.3",
                            "status": "affected"
                        },
                        {
                            "version": ">= 4.2.0, < 4.2.9",
                            "status": "affected"
                        },
                        {
                            "version": ">= 4.1.0, < 4.1.14",
                            "status": "affected"
                        },
                        {
                            "version": ">= 4.0.0, < 4.0.23",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.13.0, < 3.13.18",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-25T16:26:33.880Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "source": {
                "advisory": "GHSA-4r6f-9cpw-f6g6",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-4r6f-9cpw-f6g6",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-25T16:55:11.064286Z",
                                "id": "CVE-2026-67411",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-25T16:55:42.722Z"
                }
            }
        ]
    }
}