CVE-2026-55255

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request. This vulnerability is fixed in 1.9.1.

Affected products

Langflow

Langflow

< 1.9.1

Fix

Available

CVSS 3.1

8.4 HIGH

EPSS

0.9% (56th percentile)

Weakness

CWE-639

NVD status

Analyzed

Published

2026-06-23