CVE-2026-71424 (GCVE-0-2026-71424)
Vulnerability from cvelistv5 – Published: 2026-08-17 21:28 – Updated: 2026-08-17 21:28
VLAI
EPSS
VEX
Title
Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers
Summary
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.
Severity
9.6 (Critical)
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/onyx-dot-app/onyx/security/adv… | x_refsource_CONFIRM |
| https://github.com/onyx-dot-app/onyx/pull/11238 | x_refsource_MISC |
| https://github.com/onyx-dot-app/onyx/pull/11242 | x_refsource_MISC |
| https://github.com/onyx-dot-app/onyx/pull/11243 | x_refsource_MISC |
| https://github.com/onyx-dot-app/onyx/commit/3f3d7… | x_refsource_MISC |
| https://github.com/onyx-dot-app/onyx/commit/4001c… | x_refsource_MISC |
| https://github.com/onyx-dot-app/onyx/commit/b1039… | x_refsource_MISC |
| https://github.com/onyx-dot-app/onyx/releases/tag… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| onyx-dot-app | onyx |
Affected:
< 3.1.10
Affected: >= 3.2.0, < 3.2.14 Affected: >= 3.3.0-beta.0, < 4.0.0 |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"product": "onyx",
"vendor": "onyx-dot-app",
"versions": [
{
"status": "affected",
"version": "\u003c 3.1.10"
},
{
"status": "affected",
"version": "\u003e= 3.2.0, \u003c 3.2.14"
},
{
"status": "affected",
"version": "\u003e= 3.3.0-beta.0, \u003c 4.0.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Onyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx\u0027s GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user\u0027s 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."
}
],
"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"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-200",
"description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-863",
"description": "CWE-863: Incorrect Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T21:28:32.814Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"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"
}
],
"source": {
"advisory": "GHSA-q62f-rv3h-f822",
"discovery": "UNKNOWN"
},
"title": "Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-71424",
"datePublished": "2026-08-17T21:28:32.814Z",
"dateReserved": "2026-08-06T16:28:51.182Z",
"dateUpdated": "2026-08-17T21:28:32.814Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-71424\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-17T22:17:26.527\",\"lastModified\":\"2026-08-17T22:17:26.527\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Onyx is an open-source AI platform. Prior to 3.1.10, 3.2.14, and 4.0.0, Onyx\u0027s GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints expose another user\u0027s 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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"onyx-dot-app\",\"product\":\"onyx\",\"versions\":[{\"version\":\"\u003c 3.1.10\",\"status\":\"affected\"},{\"version\":\"\u003e= 3.2.0, \u003c 3.2.14\",\"status\":\"affected\"},{\"version\":\"\u003e= 3.3.0-beta.0, \u003c 4.0.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N\",\"baseScore\":9.6,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.1,\"impactScore\":5.8}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-200\"},{\"lang\":\"en\",\"value\":\"CWE-863\"}]}],\"references\":[{\"url\":\"https://github.com/onyx-dot-app/onyx/commit/3f3d79d1a7722fdc84a1c61c8aa830d890017e9e\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/onyx-dot-app/onyx/commit/4001cedd0a8968723bfe95dd188914ed56777910\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/onyx-dot-app/onyx/commit/b103937888fd5008067c2bb6eb6e5424576394f2\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/onyx-dot-app/onyx/pull/11238\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/onyx-dot-app/onyx/pull/11242\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/onyx-dot-app/onyx/pull/11243\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/onyx-dot-app/onyx/releases/tag/v4.0.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-q62f-rv3h-f822\",\"source\":\"security-advisories@github.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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