CVE-2026-55255

HIGH8.4

CISA KEV

Published 2026-06-23 · Updated 2026-10-25 · Source security-advisories@github.com

Summary

CVE-2026-55255 is a high-severity (CVSS 8.4) vulnerability in Langflow Langflow. CISA added it to the Known Exploited Vulnerabilities catalog on July 7, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by July 10, 2026. CISA does not currently list it as used in ransomware campaigns. Langflow has 5 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.

All 5 known-exploited Langflow vulnerabilities →

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.

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

CWE-639

CISA Known-Exploited Vulnerability

Product: Langflow — Langflow

Name: Langflow Authorization Bypass Through User-Controlled Key Vulnerability

Date added: 2026-07-07 · Due: 2026-07-10

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

References

View on NVD

More exploited Langflow vulnerabilities

Most recently added to CISA KEV

CVE-2026-0770
Langflow — Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability
added 2026-07-21
CVE-2025-34291
Langflow — Langflow Origin Validation Error Vulnerability
added 2026-05-21
CVE-2026-33017
Langflow — Langflow Code Injection Vulnerability
added 2026-03-25
CVE-2025-3248
RANSOMWARE
Langflow — Langflow Missing Authentication Vulnerability
added 2025-05-05

View all →

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