CVE-2025-71334

Flowise before version 3.0.6 (affected versions 2.2.8 and earlier) contains an arbitrary file access vulnerability due to missing validation that the chatflowId and chatId parameters are UUIDs or numbers in file handling operations. By supplying a path-traversal value (e.g., '../../../../../tmp') as the chatflow id, an unauthenticated attacker can use the /api/v1/chatflows endpoint (via addBase64FilesToStorage) to write arbitrary files, and the /api/v1/get-upload-file and /api/v1/openai-assistants-file/download endpoints (via streamStorageFile) to read arbitrary files. Arbitrary file write may lead to remote code execution.

The risk for the organization includes unauthorized reading of sensitive system files and writing of malicious files, which could lead to server compromise and privilege escalation.

Immediately upgrade Flowise to version 3.0.6 or later, which includes parameter validation fixes. Until the update is applied, restrict access to the API endpoints using a firewall or access control lists.