NifiApplication · Apache
CVE-2026-25903
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedApache NiFi 1.1.0 through 2.7.2 are missing authorization when updating configuration properties on extension components that have specific Required Permissions based on the Restricted annotation. The Restricted annotation indicates additional privileges required to add the annotated component to the flow configuration, but framework authorization did not check restricted status when updating a component previously added. The missing authorization requires a more privileged user to add a restricted component to the flow configuration, but permits a less privileged user to make property configuration changes. Apache NiFi installations that do not implement different levels of authorization for Restricted components are not subject to this vulnerability because the framework enforces write permissions as the security boundary. Upgrading to Apache NiFi 2.8.0 is the recommended mitigation.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceApache NiFi 1.1.0 through 2.7.2 has a missing authorization check when updating configuration properties on extension components that use the Restricted annotation. While the Restricted annotation requires elevated privileges to add components to the flow, the framework did not enforce these restrictions when a previously-added restricted component's properties were being modified, allowing less privileged users to alter configurations that should require higher privileges.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
NifiApplication
>= 1.1.0, < 2.8.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- High
- Privileges
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the installed Apache NiFi versionAccess the NiFi UI and navigate to the 'About' page (typically at /nifi-api/about), or run the command 'bin/nifi.sh version' from the NiFi installation directory. Locate the version number in the response.Affected if The version is 1.1.0 or higher but lower than 2.8.0
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Determine if restricted components exist in the flowIn the NiFi UI, examine the processor list or flow configuration. Look for processors or controller services that use the Restricted annotation, which typically includes processors marked as requiring elevated privileges (often indicated in documentation or processor details).Affected if Any processors or controller services with Restricted annotation are present in the flow configuration
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Review authorization policies for component modificationIn NiFi, go to the 'Policies' section under the user menu. Examine policies for 'modify' or 'configure' permissions on processors and controller services. Check if policies exist that grant modification rights to users or groups who do not have 'restricted' or elevated privileges.Affected if Policies exist that allow less privileged users to modify or configure restricted components
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Check multi-tenant authorization configurationNavigate to the 'Users' and 'Policies' administrative pages in NiFi. Verify if the authorization mechanism is configured to use granular policies rather than broad administrative access.Affected if Multi-tenant authorization is enabled with differentiated user roles
The environment is affected if NiFi version is below 2.8.0 AND restricted components exist in the flow AND authorization policies allow less privileged users to modify those restricted component properties.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped2.8.0
Upgrade to Apache NiFi 2.8.0 or later. Organizations should also audit their authorization policies to ensure proper separation between users who can add restricted components versus those who can modify them.
Apache NiFi 2.8.0
- 1. Review the Apache NiFi 2.8.0 release notes and upgrade guide for any migration requirements
- 2. Back up the current NiFi installation including flow.xml.gz, conf directory, and any custom processors
- 3. Stop the currently running NiFi service
- 4. Download Apache NiFi version 2.8.0 from the official Apache NiFi releases page (https://nifi.apache.org/download/)
- 5. Install or extract the NiFi 2.8.0 binaries to the target location
- 6. Migrate any custom configuration changes from the old conf directory to the new version (reviewing nifi.properties, bootstrap.conf, and authorizers.xml as needed)
- 7. Verify flow.xml.gz compatibility or import the flow configuration if required
- 8. Start the NiFi service and confirm all components initialize correctly
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Nifi
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,888.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-25903 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-25903 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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