CVE-2026-55255NVD

Vulnerability Summary

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.

Severity Level

HIGH(8.4)

Published Date

Jun 23, 2026

Last Modified

Jul 8, 2026

Exploitation Status

ACTIVE

EPSS Score (30-Day)

29.05%Probability

Root Weakness (CWE)

CWE-639: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 8.4 (HIGH)

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityLow

Affected & Patched Versions

Affected Versions

Langflow Langflow < 1.9.1

Patched Versions

Langflow Langflow 1.9.1

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