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

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

https://cvefeed.io/rssfeed/latest.atom / Tue, 08/18/2026 - 01:26
CVE ID :CVE-2026-71424
Published : Aug. 17, 2026, 10:17 p.m. | 12 minutes ago
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.
Severity: 9.6 | CRITICAL
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