CVE-2026-105741

Summary

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.

Affected Software

Weaknesses

• CWE-290: CWE-290: Authentication Bypass by Spoofing
• CWE-345: CWE-345: Insufficient Verification of Data Authenticity

References

• https://github.com/langflow-ai/langflow/security/advisories/GHSA-4f6c-2vvp-gw82
• https://github.com/langflow-ai/langflow/pull/13915
• https://github.com/langflow-ai/langflow/commit/1f39a4b9d62c9dfa1b21fa7f85e23a180c351b72
• https://github.com/langflow-ai/langflow/commit/94859df33acd70b2a1f816e26d68f5e89a7e5639
• https://github.com/langflow-ai/langflow/releases/tag/v1.10.3

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