CVE-2025-3248 PoC — Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code

Source

https://github.com/dennisec/Mass-CVE-2025-3248

Associated Vulnerability

Title: Langflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/code (CVE-2025-3248)
Description:Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.

Description

Mass-CVE-2025-3248

Readme

# Langflow CVE-2025-3248 Exploit Tool

![Severity](https://img.shields.io/badge/Severity-Critical-red)
![CVSS](https://img.shields.io/badge/CVSS-9.8-yellow)

## Overview

This tool exploits the critical Remote Code Execution (RCE) vulnerability **CVE-2025-3248** found in Langflow versions prior to 1.3.0.  
The vulnerability exists in the `/api/v1/validate/code` endpoint which improperly executes user-supplied code without authentication or sandboxing.

> ⚠️ **Warning:** Use this tool only on systems you own or have explicit permission to test. Unauthorized use is illegal and unethical.

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## Features

- Test if a Langflow instance is vulnerable to CVE-2025-3248  
- Demonstrate remote code execution by executing arbitrary payloads  
- Simple CLI interface with customizable target URL

File Snapshot

Remarks

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