A newly disclosed high-severity vulnerability in Apache NiFi exposes systems to an authorization bypass that could allow lower-privileged users to modify restricted components.
Tracked as CVE-2026-25903, the flaw impacts Apache NiFi versions 1.1.0 through 2.7.2 and has been fixed in version 2.8.0.
According to the Apache NiFi security advisory, the issue arises from missing authorization checks when updating configuration properties of extension components annotated as Restricted.
These restricted components require additional privileges to be added to the data flow configuration, ensuring that only trusted users can modify sensitive processing logic.
| CVE ID | Description | Affected Versions | Severity |
|---|---|---|---|
| CVE-2026-25903 | Missing authorization checks in Apache NiFi allow low-privileged users to modify restricted components. | 1.1.0–2.7.2 | High |
However, due to a flaw in the framework’s authorization model, once a restricted component was added by a privileged user, a less privileged user could still alter its configuration parameters without proper validation.
This design loophole effectively bypassed intended permission boundaries, giving limited users unintended access to modify sensitive operations within a NiFi workflow.
Attackers exploiting this vulnerability could tamper with data flow configurations, trigger unsafe system commands, or alter process logic in environments that rely on restricted components.
The vulnerability was responsibly reported by David Handermann and categorized as High severity by Apache’s Project Management Committee based on CVSS evaluation.
The NiFi team emphasized that the exploitation risk depends on how authorization levels are implemented.
In environments with authorization levels, installations without distinct privilege levels for restricted components experience reduced exposure.
Apache NiFi is widely used for building data flow automation pipelines, making this flaw particularly relevant for organizations handling sensitive or regulated data streams.
Users are strongly advised to upgrade to NiFi 2.8.0 or later to ensure that proper authorization is enforced across all restricted component updates.
Apache encourages responsible vulnerability disclosure through its private security mailing list at security@nifi.apache.org and urges users not to disclose technical details publicly until a verified remediation is released.
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