p PatchFirst

CVE-2026-105741

CVE-2026-105741 · Langflow: IP Spoofing Bypass via `X-Forwarded-For` Allowing Remote Configuration Write

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.1 · High · EPSS 0.2% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • langflow

    Versions
    • >= 1.5.0, < 1.10.3: Affected

    No fix published

  • langflow PyPI

    Versions
    • 1.10.0
    • 1.10.0rc0
    • 1.10.1
    • 1.10.1rc0
    • 1.10.1rc3
    • 1.10.2
    • 1.10.2rc4
    • 1.10.3rc0
    • 1.5.0
    • 1.5.0.post1
    • 1.5.0.post2
    • 1.5.1
    • 1.6.0
    • 1.6.1
    • 1.6.2
    • 1.6.3
    • 1.6.4
    • 1.6.5
    • 1.6.6
    • 1.6.7
    • 1.6.8
    • 1.6.9
    • 1.7.0
    • 1.7.1
    • 1.7.2
    • 1.7.3
    • 1.8.0
    • 1.8.0rc0
    • 1.8.0rc1
    • 1.8.0rc2
    • 1.8.0rc3
    • 1.8.0rc4
    • 1.8.0rc5
    • 1.8.0rc6
    • 1.8.1
    • 1.8.2
    • 1.8.3
    • 1.8.3rc0
    • 1.8.4
    • 1.9.0
    • 1.9.1
    • 1.9.2
    • 1.9.3
    • 1.9.3rc0
    • 1.9.4
    • 1.9.5
    • 1.9.6
    • 1.9.6rc0
    Affected ranges
    • ECOSYSTEM: ≥ 1.5.0, < 1.10.3

    Update to 1.10.3

Original sources

Check your server →