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CVE-2026-71424 is an information exposure vulnerability in Onyx affecting versions prior to 3.1.10, 3.2.14, and 4.0.0. The flaw is present in the MCP server API handling for the GET /api/mcp/servers and GET /api/mcp/servers/persona/{persona_id} endpoints. Per-user OAuth tokens and related client information are written by OnyxTokenStorage.set_tokens and OnyxTokenStorage.set_client_info into a shared administrative MCPConnectionConfig record. That shared record is later transformed for API output by _db_mcp_server_to_api_mcp_server, which returns the stored authentication template headers to users with BASIC_ACCESS privileges. As a result, one user can receive another user's OAuth Authorization header through normal API responses, causing cross-user disclosure of bearer credentials and associated authorization context.
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Cross-references every affected SKU, including bundled OEM variants.
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