CVE-2026-69255: Flowiseai Flowise

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the CSVAgent in packages/components/nodes/agents/CSVAgent/CSVAgent.ts extracted attacker-controlled CSV data with file.split(',').pop() and interpolated it directly into executable Python as base64_string = "${base64String}" before calling Pyodide. The validatePythonCodeForDataFrame() denylist only checked later LLM-generated code and did not validate this initial code block. An authenticated attacker could inject a closing quote followed by Python code, use Pyodide's js bridge to load Node.js child_process, and execute arbitrary operating system commands as root in the Flowise container. This issue is fixed in version 3.1.3.

Affected products

• Flowiseai Flowise: before 3.1.3 (fixed in 3.1.3)

Published 2026-08-04. Last modified 2026-09-14.