How broadly exploitable is this vulnerability?

If the affected Langflow instance is reachable over the network (e.g., internet-facing or on a shared internal network), any party with network access can potentially invoke the exposed endpoints without authentication. The scope includes all users whose data is stored behind those endpoints.

What kind of access does an attacker need to exploit this?

The attacker only needs network-level access to the Langflow API and knowledge—or discovery—of the vulnerable endpoints. No valid user account, token, or prior authentication is required to interact with those routes.

What is the safest general fix pattern for developers?

Enforce a strict, centralized authentication and authorization mechanism on all API endpoints that handle user data or system state. Design the API with a default-deny approach so that endpoints must explicitly opt in to being public; otherwise, they automatically require authentication and appropriate permissions.

Severity:

CRITICAL RISK

(9.1)

Missing Authentication Controls (CWE-306) on Sensitive Langflow API Endpoints

CVE-2026-21445

Published:

Jan 2, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-306

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

Account Takeover / Loss of Account Control

February 17, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Remote Code Execution on the Server Host

February 17, 2026

Vulnerability Type

Category:

Missing Authentication

CWE:

CWE-306

Impact:

Unauthorized Data Access and Destructive Operations

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Missing Authentication

CWE:

CWE-306

Impact:

Unauthorized Data Access and Destructive Operations

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Missing Authentication Controls (CWE-306) on Sensitive Langflow API Endpoints

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

Missing Authentication for Forgot-Password Email Change API (CWE-306)

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in node-sonos-http-api TTS Provider for macOS

Vulnerability Type

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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