CVE-2026-81866 Apache NiFi: Missing Authorization for Assets and Secrets Referenced by Connector Configuration
Authenticated users can access unauthorized secrets and assets via connector configuration APIs if granular authorization is not configured.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-81866?
CVE-2026-81866 is a low-severity missing authorization vulnerability in Apache Nifi, published on 16 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Apache NiFi 2.9.0 through 2.11.0 provide Connector configuration update and verification REST API methods that do not enforce authorization checking on Assets and Secrets referenced in proposed configuration. Updating or verifying a Connector configuration step can apply Asset and Secret references, but framework authorization was limited to write privileges on the Connector itself. As a result of the missing authorization, an authenticated user authorized to modify a Connector, but not authorized to read a referenced Parameter Provider, could apply Secret values backed by that Parameter Provider. The same methods also accepted Asset identifiers without verifying that the Asset belonged to the Connector being configured. Apache NiFi installations that do not implement different levels of authorization across Connectors and Parameter Providers are not subject to this vulnerability, because the framework enforces write permissions on the Connector as the security boundary. Upgrading to Apache NiFi 2.12.0 is the recommended mitigation, which authorizes read access to referenced Parameter Providers and verifies Connector ownership of referenced Assets during configuration update and verification.
Weakness: CWE-862
Which versions are affected by CVE-2026-81866?
1 open source package ship an affected version, including nifi. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nifi Bitnami | From 2.9.0 | 2.12.0 |
Products include Apache Nifi.
How do I fix CVE-2026-81866?
Upgrade nifi to 2.12.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-81866 being exploited?
There is no known exploitation of CVE-2026-81866 in the wild and no public exploit code.
Other vulnerabilities in Apache Nifi
- CVE-2018-1309 Improper Restriction of XML External Entity Reference in Apache NiFi
- CVE-2017-15697 Apache NiFi XSS issue in context path handling
- CVE-2017-5636 Injection in Apache NiFi
- CVE-2026-68981 Apache NiFi: Uncontrolled Resource Consumption through Decompression of HTTP Requests
- CVE-2023-36542 Apache NiFi: Potential Code Injection with Properties Referencing Remote Resources
Sources
Also known as BIT-nifi-2026-81866, GHSA-8c35-m833-7pmh, MINI-6fr7-ghfq-gmvm.