CVE-2026-55255

HighCVSS 8.4/10Known exploited (CISA KEV)Last modified Oct 7, 2026

Description

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.

Metrics

CVSS 3.1 8.4/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L

Weakness enumeration

CWE-639

Affected software

No affected versions have been published.

Timeline

Published: Jun 23, 2026
Last modified: Oct 7, 2026
Added to CISA KEV: Jul 7, 2026
NVD status: Analyzed

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