CVE-2026-44914 is a missing authorization vulnerability in Apache NiFi from versions 1.12.0 through 2.9.0. The issue arises when replacing Process Groups containing extension components annotated as Restricted, which require additional privileges. The NiFi framework failed to check the Restricted status during these replacement requests, allowing users with general write permissions to add components that should require higher privileges. Installations that enforce specific authorization for Restricted components are not vulnerable because the framework's write permission boundary prevents exploitation. The recommended mitigation is upgrading to Apache NiFi 2.9.0, which removes the Restricted status authorization from the framework.

An attacker with general write access to Apache NiFi could exploit this vulnerability to add components that require higher privileges than they should have, potentially leading to unauthorized actions within the system. This could weaken the security boundary intended by the Restricted annotation. However, systems that have implemented specific authorization controls for Restricted components are not affected. There are no known exploits in the wild at this time.

No official patch or fix is explicitly stated in the vendor advisory. However, upgrading to Apache NiFi version 2.9.0 is recommended as it removes the framework's implementation of Restricted status authorization, effectively mitigating the vulnerability. Until upgrade, ensure that specific authorization for Restricted components is implemented to prevent exploitation. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.