A vulnerability in Apache NiFi Lower-privileged users may be able to alter restricted components on systems due to a recently discovered high-severity vulnerability in Apache NiFi that exposes systems to an authorization bypass. The vulnerability, which affects Apache NiFi versions 1.1.0 through 2.7.2 and has been fixed in version 2.8.0, is tracked as CVE-2026-25903. The Apache NiFi security advisory states that the problem occurs when authorization checks are not performed when changing the configuration properties of extension components that have been marked as restricted.

To ensure that only trusted users can alter sensitive processing logic, these restricted components necessitate adding extra privileges to the data flow configuration. CVE Number Versions Affected by the Description CVE-2026-25903 Severity Low-privileged users can alter restricted components in Apache NiFi due to missing authorization checks.

1.1.0–2.7.2 Elevated However, once a privileged user added a restricted component, a less privileged user could still change its configuration parameters without adequate validation because of a flaw in the authorization model of the framework. Due to this design flaw, restricted users were able to alter sensitive operations within a NiFi workflow without authorization, effectively circumventing the intended permission boundaries. By taking advantage of this vulnerability, attackers could change process logic in environments that depend on restricted components, trigger unsafe system commands, or tamper with data flow configurations.

David Handermann responsibly reported the vulnerability, and Apache's Project Management Committee classified it as High severity based on the CVSS evaluation. The NiFi team stressed that the implementation of authorization levels determines the exploitation risk.

Installations without specific privilege levels for restricted components are less exposed in authorization-leveled environments. Because Apache NiFi is frequently used to create data flow automation pipelines, businesses that handle regulated or sensitive data streams should be especially aware of this vulnerability. To guarantee that appropriate authorization is applied to all restricted component updates, users are strongly encouraged to update to NiFi 2.8.0 or later.

Through its private security mailing list at security@nifi.apache.org, Apache promotes responsible vulnerability disclosure. Users are advised not to publicly share technical details until a verified remediation has been made available. X, LinkedIn, and LinkedIn for daily ZeroOwl. To have your stories featured, get in touch with us.