CVE-2026-82561 Apache NiFi: Missing Authorization for Components Referenced in Flow Update Methods
Authenticated users with write access can modify protected components in descendant groups or bind unauthorized services due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-82561?
CVE-2026-82561 is a medium-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 1.5.0 through 2.11.0 provide REST API methods that replace the entire contents of a Process Group using a client-supplied flow definition, covering Process Group flow replacement together with versioned flow update and rebase operations. Framework authorization for these methods was limited to read and write privileges on the Process Group itself, unlike the corresponding asynchronous update request methods, which also authorize the components encapsulated in the Process Group along with referenced Controller Services, Parameter Contexts, and Parameter Providers. As a result of the missing authorization, an authenticated user with write access to a Process Group could supply a flow definition that modifies or removes components in descendant Process Groups protected by more restrictive access policies, and could bind components to Controller Services and Parameter Contexts without authorization for those referenced components. Existing verification checks limited the impact to stopped components, and the issue applies only to deployments that use component-level authorization policies, because the framework enforces write permissions as the security boundary. Upgrading to Apache NiFi 2.12.0 is the recommended mitigation, which applies consistent reference resolution and component authorization across Process Group replacement and versioned flow update methods
Weakness: CWE-862
Which versions are affected by CVE-2026-82561?
1 open source package ship an affected version, including nifi. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nifi Bitnami | From 1.5.0 | 2.12.0 |
Products include Apache Nifi.
How do I fix CVE-2026-82561?
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-2026-82561 being exploited?
There is no known exploitation of CVE-2026-82561 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-2026-82561, GHSA-hfp7-cf28-6f6q, MINI-76mw-rg95-q793.