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CVE-2026-6599— langflow-ai langflow Model Context Protocol Configuration API mcp_projects.py install_mcp_config injection

CVSS 6.3 · Medium EPSS 0.05% · P14
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I. Basic Information for CVE-2026-6599

Vulnerability Information
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Vulnerability Title
langflow-ai langflow Model Context Protocol Configuration API mcp_projects.py install_mcp_config injection
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability was detected in langflow-ai langflow up to 1.8.3. The impacted element is the function get_client_ip/install_mcp_config of the file src/backend/base/langflow/api/v1/mcp_projects.py of the component Model Context Protocol Configuration API. Performing a manipulation of the argument X-Forwarded-For results in injection. The attack may be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Langflow 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Langflow是Langflow开源的一个用于构建多代理和 RAG 应用程序的可视化框架。 Langflow 1.8.3及之前版本存在安全漏洞，该漏洞源于对文件src/backend/base/langflow/api/v1/mcp_projects.py中函数get_client_ip/install_mcp_config的错误操作，可能导致注入攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
langflow-ailangflow 1.8.0 cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-6599

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III. Intelligence Information for CVE-2026-6599

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Same Patch Batch · langflow-ai · 2026-04-20 · 5 CVEs total

CVE-2026-65967.3 HIGHlangflow-ai langflow API Endpoint endpoints.py create_upload_file unrestricted upload
CVE-2026-65984.3 MEDIUMlangflow-ai langflow Project Creation Endpoint projects.py encrypt_auth_settings cleartext
CVE-2026-66003.5 LOWlangflow-ai langflow Frontend React Component Rendering edit-message.tsx cross site script
CVE-2026-65972.7 LOWlangflow-ai langflow Flow Using API core.py has_api_terms credentials storage

IV. Related Vulnerabilities

Same product: langflow
Same vendor: langflow-ai
Same weakness: CWE-74

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