CVE-2019-12421: Apache Nifi

High severity, CVSS 8.8. EPSS: 1.8% chance of exploitation in the next 30 days.

When using an authentication mechanism other than PKI, when the user clicks Log Out in NiFi versions 1.0.0 to 1.9.2, NiFi invalidates the authentication token on the client side but not on the server side. This permits the user's client-side token to be used for up to 12 hours after logging out to make API requests to NiFi.

Affected products

• Apache Nifi: from 1.0.0, up to and including 1.9.2

Published 2019-11-19. Last modified 2026-06-17.