---
id: CVE-2026-81866
title: >-
  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
summary: >-
  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 Conn…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-862
vendor: apache
product: nifi
affected:
  - 'nifi >= 2.9.0, < 2.12.0'
patched:
  - nifi 2.12.0
published: '2026-09-16'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T13:38:18.860'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81866'
references:
  - url: 'https://lists.apache.org/thread/rv49gwf4yb00ykv0zzfd509boxflolsf'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/16/8'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
  - score-dispute
epss: 0.00564
epssPercentile: 0.44561
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T12:26:58.334323Z'
scores:
  nvd: 4.3
  cna: 0.5
ingestedAt: '2026-09-16T20:03:30.766Z'
---

## Overview

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.

## Affected

- `nifi >= 2.9.0, < 2.12.0`

## Remediation

Upgrade past the affected range:

- `nifi 2.12.0`