CVE-2026-105741
Langflow: IP Spoofing Bypass via `X-Forwarded-For` Allowing Remote Configuration Write
CVSS Score
7.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-290 CWE-345 |
| Vendor | langflow-ai |
| Product | langflow |
| Published | Oct 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low
Affected Versions
langflow-ai / langflow
>= 1.5.0, < 1.10.3
References
github.com: https://github.com/langflow-ai/langflow/security/advisories/GHSA-4f6c-2vvp-gw82 github.com: https://github.com/langflow-ai/langflow/pull/13915 github.com: https://github.com/langflow-ai/langflow/commit/1f39a4b9d62c9dfa1b21fa7f85e23a180c351b72 github.com: https://github.com/langflow-ai/langflow/commit/94859df33acd70b2a1f816e26d68f5e89a7e5639 github.com: https://github.com/langflow-ai/langflow/releases/tag/v1.10.3