8.8

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2026-21445

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

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.

(GitHub Advisory)

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CVE-2026-21445

CVE-2026-21445:

8.8

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
langflow-base	pip	< 1.5.1	1.5.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a classic case of Missing Authentication for Critical Function (CWE-306). Several API endpoints in the Langflow application, particularly within the monitor.py module, were defined without the necessary authentication checks. In a FastAPI application, this is typically handled by including a Depends function in the endpoint's dependencies to verify the user's session or token.

The root cause was the omission of the dependencies=[Depends(get_current_active_user)] argument in the FastAPI router decorators for these endpoints. This meant that no authentication was required to access them. An unauthenticated attacker could directly call these endpoints and perform sensitive actions such as reading all user conversation data (get_messages), accessing transaction logs (get_transactions), and deleting message histories (delete_messages_session).

The provided commit 3fed9fe1b5658f2c8656dbd73508e113a96e486a remediates this vulnerability by adding the required authentication dependency to a wide range of endpoints, including the ones identified in the advisory. This ensures that only authenticated users can access these sensitive functions.

Vulnerable functions

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Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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