CVE-2026-105741
Description
Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.5.0 until 1.10.3, an IP spoofing vulnerability in the Model Context Protocol (MCP) configuration installation endpoint (POST /api/v1/mcp/project/{project_id}/install) allowed authenticated remote attackers to bypass the "local-only" access restriction. By sending a spoofed X-Forwarded-For: 127.0.0.1 header, an attacker could make the server treat the request as originating from localhost, letting them write/overwrite an MCP client configuration file on the server's filesystem. This vulnerability is fixed in 1.10.3.
How to fix
- langflow1.10.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| langflowPyPI | 1.5.0 ≤ v < 1.10.3 | 1.10.3 |
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