CVE-2026-9103: Langflow

Critical severity, CVSS 9.8. EPSS: 3.2% chance of exploitation in the next 30 days.

IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to gain unauthorized access due to improper authentication in the /api/v1/login/auto_login endpoint. The endpoint issues long-lived superuser bearer tokens without requiring authentication when the AUTO_LOGIN configuration is enabled (enabled by default), which may allow an unauthenticated network attacker to obtain full administrative access. Additionally, permissive cross-origin resource sharing (CORS) settings may allow tokens to be exposed to unintended origins, increasing the risk of unauthorized access.

Affected products

• Langflow Langflow: from 1.0.0, before 1.10.1 (fixed in 1.10.1)

Published 2026-07-17. Last modified 2026-07-23.