What is CVE-2026-21445?

CVE-2026-21445 is a critical-severity vulnerability in Langflow, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-01-02.

How severe is CVE-2026-21445?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Auth bypass in Langflow

CVE-2026-21445

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 acce…

Vulnerability class: Broken Authentication

EPSS: 0.207 (97.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Langflow
Langflow-ai Langflow — versions < 1.7.0.dev45

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-21445?: CVE-2026-21445 is a critical-severity vulnerability in Langflow, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-01-02.
How severe is CVE-2026-21445?: Critical severity. CVSS v3 base score is 9.1 out of 10.