7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-33484

CVE-2026-33484: Langflow has Unauthenticated IDOR on Image Downloads

Langflow is a tool for building and deploying AI-powered agents and workflows. In versions 1.0.0 through 1.8.1, the /api/v1/files/images/{flow_id}/{file_name} endpoint serves image files without any authentication or ownership check. Any unauthenticated request with a known flow_id and file_name returns the image with HTTP 200. In a multi-tenant deployment, any attacker who can discover or guess a flow_id (UUIDs can be leaked through other API responses) can download any user's uploaded images without credentials. Version 1.9.0 contains a patch.

(GitHub Advisory)

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CVE-2026-33484

CVE-2026-33484:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation pocAutomatable YesTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
langflow	pip	>= 1.0.0, < 1.9.0	1.9.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability description explicitly points to the download_image function in src/backend/base/langflow/api/v1/files.py as the source of the unauthenticated IDOR. The vulnerability lies in the function's failure to check for authentication and ownership when serving image files. By analyzing the commits between the last vulnerable version (v1.8.1) and the first patched version (v1.9.0), I identified the security fix in commit 04b4af6e0f0d71bae10b9d4ce7b30e3377a25cae. The patch modifies the download_image function signature, replacing the vulnerable direct flow_id parameter with a Depends(get_flow) dependency. This dependency injection is a standard way in FastAPI to handle authentication and resource ownership, confirming that the original implementation was insecure. The added tests in the same commit further validate that unauthenticated and cross-tenant access is now blocked, confirming the nature of the fix and the vulnerable function.

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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