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CVE-2026-21445— Langflow Missing Authentication on Critical API Endpoints

Quick assessment

Affected
langflow-ai langflow
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 1.7.0.dev45之前版本存在访问控制错误漏洞，该漏洞源于多个关键API端点缺少身份验证控制，可能导致未经验证的用户访问敏感数据并执行破坏性操作。

AI Predicted 9.8 Difficulty: Trivial EPSS 34.70% · P98

Public Exploits 1

Nuclei · 1 CVE-2026-21445.yaml [template]
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I. Basic Information for CVE-2026-21445

Vulnerability Information
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Vulnerability Title
Langflow Missing Authentication on Critical API Endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.7.0.dev45, multiple critical API endpoints in Langflow are missing authentication controls. The issue allows any unauthenticated user to access sensitive user conversation data, transaction histories, and perform destructive operations including message deletion. This affects endpoints handling personal data and system operations that should require proper authorization. Version 1.7.0.dev45 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Langflow 访问控制错误漏洞
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 1.7.0.dev45之前版本存在访问控制错误漏洞，该漏洞源于多个关键API端点缺少身份验证控制，可能导致未经验证的用户访问敏感数据并执行破坏性操作。
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

Vendor Product Affected Versions CPE Subscribe
langflow-ai langflow < 1.7.0.dev45 -

II. Public POCs for CVE-2026-21445

# POC Description Source Link Shenlong Link
1 Academic proof-of-concept demonstrating CVE-2026-21445 [LangFlow] for authorized security research. https://github.com/chinaxploiter/CVE-2026-21445-PoC POC Details
2 Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.7.0.dev45, multiple critical API endpoints in Langflow are missing authentication controls. The issue allows any unauthenticated user to access sensitive user conversation data, transaction histories, and perform destructive operations including message deletion. This affects endpoints handling personal data and system operations that should require proper authorization. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21445.yaml POC Details
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III. Intelligence Information for CVE-2026-21445

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Patches & Fixes for CVE-2026-21445 (1)

Vendor Advisories for CVE-2026-21445 (1)

IV. Related Vulnerabilities

Same product: langflow
Same vendor: langflow-ai
Same weakness: CWE-306

V. Comments for CVE-2026-21445

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