VulnCheck KEV: CVE-2026-55255

Langflow contains an authorization bypass through user-controlled key vulnerability which allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request...

CVE-2026-55255 Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow

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...

Missing Authorization

Overview Affected versions of this package are vulnerable to Missing Authorization via the readflow helper in src/backend/base/langflow/api/v1/flows.py. An attacker can read, modify, or delete another user's flow by supplying that flow's UUID to the GET, PATCH, or DELETE /api/v1/flow/flowid...