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 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.
Vulnerability class: Broken Authentication
EPSS: 0.337 (98.3th 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)
Public proof-of-concept exploits
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.
- Is CVE-2026-21445 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.