CVE-2026-19875

IBM Langflow OSS versions 1.0.0 through 1.10.0 contain an authentication bypass in the POST /api/v2/registration/ endpoint (CWE-306). An unauthenticated remote attacker can overwrite the server's registered admin email address and trigger outbound telemetry calls, enabling the instance to be abus...

Security Bulletin: Unauthenticated Registration POST Endpoint Permits Admin Email Overwrite and Outbound Relay Abuse in Langflow

Summary The POST /api/v2/registration/ endpoint in affected versions lacked authentication requirements, allowing unauthenticated attackers to overwrite the server's registered admin email address and trigger outbound telemetry calls to external servers, enabling the Langflow instance to be abuse...