VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 8.8 highEPSS 33.3% probability of exploitation in 30 days
Langflow

CVE-2026-21445: Langflow Missing Authentication on Critical API Endpoints

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 3 public reports, the first from .

How likely is exploitation in the next 30 days?
33.3%

EPSS score, percentile 98.4 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
8.8 High

CVSS v4.0 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • < 1.7.0.dev45

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

Langflow Missing Authentication on Critical API Endpoints

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.

Source: CVE List, as of . About the data.

What to do

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (1 product)
langflow-ai langflow
StatusVersions
Affected< 1.7.0.dev45

Source: CVE List, as of . About the data.

Weakness

CWE-306
  • CWE-306: Missing Authentication for Critical Function

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

2

Known exploited Langflow vulnerabilities

  • CVE-2026-0770: Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability (added )
  • CVE-2026-55255: Langflow Authorization Bypass Through User-Controlled Key Vulnerability (added )
  • CVE-2025-34291: Langflow Origin Validation Error Vulnerability (added )
  • CVE-2026-33017: Langflow Code Injection Vulnerability (added )
  • CVE-2025-3248: Langflow Missing Authentication Vulnerability (added )