Vulnerability record · CVE-2026-21445 · published 2 January 2026

CVE-2026-21445: Langflow missing authentication for critical function vulnerability

Langflow · Langflow

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.7.0.dev45, multiple critical API endpoints in Langflow are missing authentication controls. The issue allows any unauthenticated user to access sensitive user conversation data, transaction histories, and perform destructive operations including message deletion. This affects endpoints handling personal data and system operations that should require proper authorization. Version 1.7.0.dev45 contains a patch.

8.8 CVSS 4.0 High EPSS 34% · top 1.7% CWE-306 · Missing authentication for critical function

8.8CVSS 4.0 base score

34%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

2References, 1 tagged exploit

17 Jun 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Langflow Langflow

References

Link	Tags
https://github.com/langflow-ai/langflow/commit/3fed9fe1b5658f2c8656dbd73508e113a96e486a	Patch
https://github.com/langflow-ai/langflow/security/advisories/GHSA-c5cp-vx83-jhqx	ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-21445), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.