CVE-2025-3248: Langflow Missing Authentication Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2025-05-05. EPSS: 100% chance of exploitation in the next 30 days.

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.

Affected products

• Langflow Langflow: before 1.3.0 (fixed in 1.3.0)

Published 2025-04-07. Last modified 2026-10-08.