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NVD / CVE Program· CNA apache

CVE-2026-39816: Apache NiFi: Missing Execute Code Required Permission on TinkerpopClientService

Noroxi assessment

Priority: Monitor (action score 30/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.76% (FIRST EPSS); higher than 55.5% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: org.apache.nifi:nifi-other-graph-services-nar (Maven) 2.9.0.

Low priority for now. Upgrade to org.apache.nifi:nifi-other-graph-services-nar (Maven) 2.9.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The optional extension component TinkerpopClientService is missing the Restricted annotation with the Execute Code Required Permission in Apache NiFi 2.0.0-M1 through 2.8.0. The TinkerpopClientService supports configuration of ByteCode Submission for the Script Submission Type, enabling Groovy Script execution in the service prior to submitting the query. The missing Restricted annotation allows users without the Execute Code Permission to configure the Service in installations that use fine-grained authorization and have the optional TinkerpopClientService installed. Apache NiFi installations that do not have the nifi-other-graph-services-nar installed are not subject to this vulnerability. Upgrading to Apache NiFi 2.9.0 is the recommended mitigation.

HighCVSS 7.5 · v4.0—Proof of concept Fix available
Published
May 8, 2026
Updated
Oct 26, 2026
EPSS
0.7% · 55th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · apache
7.5
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/AU:Y/R:I/V:C/RE:L/U:Green

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-39816

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachenifi

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache nifi2.0.0 and later · before 2.9.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache NiFi

    • 2.0.0-M1 and later · up to and including 2.8.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Mavenorg.apache.nifi:nifi-other-graph-services-narfrom 2.0.0-M1 · before 2.9.02.9.0

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-34468Apache NiFi: Potential Code Injection with Database Services using H2
    54Plan
  • CVE-2018-1309Apache NiFi External XML Entity issue in SplitXML processor.
    40Plan
  • CVE-2017-15697A malicious X-ProxyContextPath or X-Forwarded-Context header containing external resources or embedded code could cause remote code executio
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-66524Dec 19, 2025 · Apache NiFi: Deserialization of Untrusted Data in GetAsanaObject Processor
    30Monitor
  • ← EarlierCVE-2026-25903Feb 17, 2026 · Apache NiFi: Missing Authorization of Restricted Permissions for Component Updates
    34Monitor
  • Later →CVE-2026-44911Jun 22, 2026 · Apache NiFi: Incorrect Authorization for Configuration Verification Requests
    9Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Maven:org.apache.nifi:nifi-other-graph-services-nar2.9.0Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:12026-04-28

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-11 d
  2. Published
  3. TodayNov 9, 2026+185 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-2590380 days apartApache NiFi: Missing Authorization of Restricted Permissions for Component Updates
    34Monitor
  • CVE-2026-4491445 days apartApache NiFi: Missing Authorization of Restricted Permissions when Replacing Flow Contents
    30Monitor
  • CVE-2026-6897987 days apartApache NiFi: Missing Authorization for Components Referenced by Parameter Context Updates
    23Monitor
  • CVE-2026-82561131 days apartApache NiFi: Missing Authorization for Components Referenced in Flow Update Methods
    23Monitor
  • CVE-2026-86089131 days apartApache NiFi: Missing Process Group Authorization for Connector Migration
    9Monitor
  • CVE-2026-81866131 days apartApache NiFi: Missing Authorization for Assets and Secrets Referenced by Connector Configuration
    2Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
X

Weakness class (CWE)

CWE-862 · Missing Authorization

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:I/V:C/RE:L/U:Green

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records