8.8

CVE-2026-39816: apache software foundation apache nifi Missing Authorization

CVSS: 8.8v3.1HighModified
AliasesGHSA-2j9m-25xv-mp6rBIT-nifi-2026-39816
Published 08-05-2026Last modified 09-05-2026
Open JSON

Vulnerability summary

CVE-2026-39816 is a high (CVSS 8.8) Missing Authorization vulnerability in apache software foundation apache nifi. EPSS estimates a 0.89% chance of exploitation in the next 30 days, higher than 58.6% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
0.89%
0%100%
Low · +0.13 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-05-2026
    PublishedVulnerability first disclosed.
  2. 09-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.89%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

+0.13 pp

From 0.76% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.89%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apache1 product
  • nifi≥ 2.0.0, < 2.9.0
Apache software foundation1 product
Org.apache.nifi1 product
  • nifi-other-graph-services-nar≥ 2.0.0-M1, < 2.9.0

3 vendors · 3 products

References

7 links