{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-71424",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-08-06T16:28:51.182Z",
        "datePublished": "2026-08-17T21:28:32.814Z",
        "dateUpdated": "2026-08-18T17:47:10.013Z"
    },
    "containers": {
        "cna": {
            "title": "Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-200",
                            "lang": "en",
                            "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-863",
                            "lang": "en",
                            "description": "CWE-863: Incorrect Authorization",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 9.6,
                        "baseSeverity": "CRITICAL",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "LOW",
                        "scope": "CHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822"
                },
                {
                    "name": "https://github.com/onyx-dot-app/onyx/pull/11238",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/onyx-dot-app/onyx/pull/11238"
                },
                {
                    "name": "https://github.com/onyx-dot-app/onyx/pull/11242",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/onyx-dot-app/onyx/pull/11242"
                },
                {
                    "name": "https://github.com/onyx-dot-app/onyx/pull/11243",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/onyx-dot-app/onyx/pull/11243"
                },
                {
                    "name": "https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e"
                },
                {
                    "name": "https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910"
                },
                {
                    "name": "https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2"
                },
                {
                    "name": "https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0"
                }
            ],
            "affected": [
                {
                    "vendor": "onyx-dot-app",
                    "product": "onyx",
                    "versions": [
                        {
                            "version": "< 3.1.10",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.2.0, < 3.2.14",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.3.0-beta.0, < 4.0.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-17T21:28:32.814Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Onyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx's GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user's OAuth Authorization header because OnyxTokenStorage.set_tokens and OnyxTokenStorage.set_client_info in backend/onyx/server/features/mcp/api.py copy per-user tokens into a shared admin MCPConnectionConfig row and _db_mcp_server_to_api_mcp_server returns that row through auth_template.headers to any BASIC_ACCESS user. This issue is fixed in versions 3.1.10, 3.2.14, and 4.0.0."
                }
            ],
            "source": {
                "advisory": "GHSA-q62f-rv3h-f822",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-08-18T17:28:35.060950Z",
                                "id": "CVE-2026-71424",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-08-18T17:47:10.013Z"
                }
            }
        ]
    }
}