Langflow: IP Spoofing Bypass via `X-Forwarded-For` Allowing Remote Configuration Write

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-105741
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-05 21:16:35 UTC
Updated2026-10-05 21:16:35 UTC
DescriptionLangflow 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Problem Types: CWE-290 | CWE-345 | CWE-290 CWE-290: Authentication Bypass by Spoofing | CWE-345 CWE-345: Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Langflow-ai Langflow affected >= 1.5.0, < 1.10.3 Not specified

References

ReferenceSourceLinkTags
github.com/langflow-ai/langflow/commit/1f39a4b9d62c9dfa1b21fa7f85e23a180... [email protected] github.com
github.com/langflow-ai/langflow/releases/tag/v1.10.3 [email protected] github.com
github.com/langflow-ai/langflow/commit/94859df33acd70b2a1f816e26d68f5e89... [email protected] github.com
github.com/langflow-ai/langflow/pull/13915 [email protected] github.com
github.com/langflow-ai/langflow/security/advisories/GHSA-4f6c-2vvp-gw82 [email protected] github.com
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