CVE WatchOct 8, 2026

CVE-2025-3248

Langflow Missing Authentication Vulnerability

CVSS

9.8

Critical

EPSS

100.0%

p100

KEV

YES

May 5, 2025

Exploit Today

0-100

Published: Apr 7, 2025 · Last modified: Oct 8, 2026 · CWE-306 · CWE-94

EPSS · 30d

100.0%EPSS · 30 days100.0%

2026-09-162026-10-14

KEV catalog record

Product

Langflow / Langflow

Vulnerability

Langflow Missing Authentication Vulnerability

Added to KEV

May 5, 2025

Remediate by

May 26, 2025

Known ransomware use

Yes

Summary description

Langflow contains a missing authentication vulnerability in the /api/v1/validate/code endpoint that allows a remote, unauthenticated attacker to execute arbitrary code via crafted HTTP requests.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes

This vulnerability affects a common open-source project, third-party library, or a protocol used by different products. For more information, please see: https://github.com/advisories/GHSA-c995-4fw3-j39m ; https://nvd.nist.gov/vuln/detail/CVE-2025-3248

Technical description

Langflow versions prior to 1.3.0 are susceptible to code injection in the /api/v1/validate/code endpoint. A remote and unauthenticated attacker can send crafted HTTP requests to execute arbitrary code.

Official references

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