CVE-2026-105741: Langflow: IP Spoofing Bypass via `X-Forwarded-For` Allowing Remote Configuration Write
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.
References
- github.com/advisories/GHSA-4f6c-2vvp-gw82
- github.com/langflow-ai/langflow/commit/1f39a4b9d62c9dfa1b21fa7f85e23a180c351b72
- github.com/langflow-ai/langflow/commit/94859df33acd70b2a1f816e26d68f5e89a7e5639
- github.com/langflow-ai/langflow/pull/13915
- github.com/langflow-ai/langflow/releases/tag/v1.10.3
- github.com/langflow-ai/langflow/security/advisories/GHSA-4f6c-2vvp-gw82
- nvd.nist.gov/vuln/detail/CVE-2026-105741
Code Behaviors & Features
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