onyx-dot-app vulnerabilities and threats

A security vulnerability has been detected in onyx-dot-app Onyx up to 5.0.0. Impacted is an unknown function of the file web/src/app/craft/components/output-panel/PreviewTab.tsx. The manipulation leads to cross site scripting. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Onyx 4.6.6 fails to properly restrict access to custom tool credentials stored in custom_headers, allowing any authenticated user to read admin-defined API keys. Attackers with basic authentication can call GET /tool/{tool_id} or GET /tool endpoints to retrieve plaintext authorization headers and third-party API credentials, then use them to directly access upstream APIs.

Onyx Enterprise Edition versions prior to 4.3.0 contain an authorization bypass vulnerability in specific user group management endpoints. This flaw allows a curator to add accounts to arbitrary user groups without proper validation, potentially granting unauthorized document access. The issue is resolved in version 4.3.0.

Onyx versions prior to 3.1.10, 3.2.14, and 4.0.0 contain a vulnerability where certain API endpoints expose another user's OAuth Authorization header to unauthorized BASIC_ACCESS users. This occurs due to per-user tokens being copied into a shared admin configuration and then returned in API responses. The issue has been fixed in versions 3.1.10, 3.2.14, and 4.0.0.

CVE-2026-42277 is an authorization bypass vulnerability in the onyx open-source AI platform. Before fixed versions 3.0.9, 3.1.6, and 3.2.6, authenticated users could download files uploaded by other users by supplying the file UUID to the GET /chat/file/{file_id} endpoint. The endpoint verified authentication but did not verify file ownership, allowing unauthorized access to confidential files. This vulnerability has been patched in the specified versions.

CVE-2026-42276 is an authorization bypass vulnerability in the onyx open-source AI platform affecting versions prior to 3.0.9, 3.1.6, and 3.2.6. The POST /chat/stop-chat-session/{chat_session_id} endpoint allows any authenticated user to stop another user's active chat session without verifying ownership of the session. This enables an attacker who knows a chat session UUID to interrupt another user's LLM generation mid-stream. The vulnerability has been patched in versions 3.