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CVE-2025-59528: Flowise is a drag & drop user interface to build a customized large language model flow. In version …

Occurred
Sep 22, 2025
Published
Sep 22, 2025
Source
NVD CVE

Summary

Flowise is a drag & drop user interface to build a customized large language model flow. In version 3.0.5, Flowise is vulnerable to remote code execution. The CustomMCP node allows users to input configuration settings for connecting to an external MCP server. This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation. Specifically, inside the convertToValidJSONString function, user input is directly passed to the Function() constructor, which evaluates and executes the input as JavaScript code. Since this runs with full Node.js runtime privileges, it can access dangerous modules such as child_process and fs. This issue has been patched in version 3.0.6.

Tags

  • CVE
  • CVE-2025-59528
  • cvss:CRITICAL

Classification

Category confidence: 90%
Severity confidence: 85%

Rationale: CVE describes RCE vulnerability in LLM workflow tool Flowise allowing arbitrary code execution.

Classifier: Qwen/Qwen3.5-35B-A3B-FP8

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