CVE-2026-21445: high-severity vulnerability in langflow-ai langflow
Langflow Missing Authentication on Critical API Endpoints
Published · Updated
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70Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actcvss 8.8epss 33%
from disclosure to weapon
Published on NVDJan 2
VulnCheck+97d
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.
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
Affected products
langflow-ai · langflowRelated CVEs — langflow-ai langflow
In the same product, most dangerous first.
CVE-2025-3248CRITICALLangflow < 1.3.0 Unauthenticated RCE via /api/v1/validate/codeEPSS 100.0%KEVCVE-2026-33017CRITICALLangflow has Unauthenticated Remote Code Execution via Public Flow Build EndpointEPSS 96.4%KEVCVE-2026-55255HIGHLangflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's FlowEPSS 0.9%KEVCVE-2026-5027HIGHLangflow - Path Traversal Arbitrary File Write via upload_user_fileEPSS 40.0%CVE-2026-27966CRITICALLangflow has Remote Code Execution in CSV AgentEPSS 35.2%CVE-2026-33497HIGHLangflow: /profile_pictures/{folder_name}/{file_name} endpoint file readingEPSS 19.6%