What happened
A high-severity vulnerability in Apache NiFi, tracked as CVE-2026-25903, allows lower-privileged users to bypass authorization controls and modify restricted components in affected systems. The flaw impacts Apache NiFi versions 1.1.0 through 2.7.2 and results from missing authorization checks when updating configuration properties of restricted extension components. Once a privileged user adds a restricted component, a lower-privileged user could alter its configuration without proper validation, potentially modifying data flows, triggering unsafe system commands, or changing processing logic. The vulnerability was reported by David Handermann and fixed in Apache NiFi version 2.8.0.Â
Who is affected
Organizations using vulnerable versions of Apache NiFi, particularly those relying on restricted components and role-based access controls in data flow automation pipelines, are affected.
Why CISOs should care
The vulnerability affects a widely used data automation platform, where unauthorized modification of restricted components could alter sensitive workflows and impact data integrity and processing logic.
3 practical actions
- Upgrade Apache NiFi immediately. Install version 2.8.0 or later to remediate CVE-2026-25903.
- Audit user privilege configurations. Review role-based access controls for restricted components.
- Review data flow integrity. Verify that workflows and restricted components have not been modified by unauthorized users.