Vulnerability · Published Jan 2, 2026 · Assigned by GitHub_M
CVE-2026-21445Langflow Missing Authentication on Critical API Endpoints
High 8.8
In plain English
A high-severity missing authentication in langflow from langflow-ai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 33.3% (higher than 98% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | langflow | 1.7.1 | GHSA-c5cp-vx83-jhqx |
| PyPI | langflow | 1.7.1 | PYSEC-2026-1524 |
| PyPI | langflow-base | 0.7.1 | GHSA-c5cp-vx83-jhqx |
| PyPI | langflow-base | 0.7.1 | PYSEC-2026-2571 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| langflow-ai | langflow | < 1.7.0.dev45 |
Weakness: CWE-306 · Vector: 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