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CVE-2026-71424— Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers

Quick assessment

Affected
onyx-dot-app onyx
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

onyx-dot-app Onyx是美国onyx-dot-app公司开源的一个AI聊天工具，可以连接到文档和应用程序。 onyx-dot-app Onyx 3.1.10之前版本、3.2.0至3.2.14之前版本和3.3.0-beta.0至4.0.0之前版本存在安全漏洞，该漏洞源于OnyxTokenStorage.set_tokens和OnyxTokenStorage.set_client_info将每个用户的令牌复制到共享的管理员MCPConnectionConfig行中，导致GET /api/mcp/s

CVSS 9.6 · Critical EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 3

VendorProduct Version RangeStatus
onyx-dot-app onyx < 3.1.10 affected
>= 3.2.0, < 3.2.14 affected
>= 3.3.0-beta.0, < 4.0.0 affected
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I. Basic Information for CVE-2026-71424

Vulnerability Information
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Vulnerability Title
Onyx: Cross-user OAuth-token leak via /api/mcp/servers* for per-user MCP servers
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
onyx-dot-app Onyx 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
onyx-dot-app Onyx是美国onyx-dot-app公司开源的一个AI聊天工具，可以连接到文档和应用程序。 onyx-dot-app Onyx 3.1.10之前版本、3.2.0至3.2.14之前版本和3.3.0-beta.0至4.0.0之前版本存在安全漏洞，该漏洞源于OnyxTokenStorage.set_tokens和OnyxTokenStorage.set_client_info将每个用户的令牌复制到共享的管理员MCPConnectionConfig行中，导致GET /api/mcp/s
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
onyx-dot-app onyx < 3.1.10 -

II. Public POCs for CVE-2026-71424

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 11317 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-71424

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Patches & Fixes for CVE-2026-71424 (6)

Vendor Advisories for CVE-2026-71424 (1)

Vendor Pages for CVE-2026-71424 (1)

IV. Related Vulnerabilities

Same product: onyx
Same vendor: onyx-dot-app
Same weakness: CWE-200

V. Comments for CVE-2026-71424

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