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

CVSS 9.6 · Critical

Possible ATT&CK Techniques 1AI

T1530 · Data from Cloud Storage
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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

Affected Products

VendorProductAffected VersionsCPESubscribe
onyx-dot-apponyx < 3.1.10 -

II. Public POCs for CVE-2026-71424

#POC DescriptionSource LinkShenlong Link
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 11317 chars
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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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