CVE-2026-21445 HIGH

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

Vendor Langflow-Ai
Product langflow
Weakness CWE-306 · Missing auth
Published January 2, 2026
Last update February 26, 2026

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 2, 2026 CVE published
February 26, 2026 Record updated