Auth bypass in Apache Nifi
CVE-2026-39816
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 Sub…
Vulnerability class: Broken Access Control
EPSS: 0.000 (3.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Apache Nifi
- Apache Software Foundation Nifi — versions 2.0.0-M1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2026-39816?
- CVE-2026-39816 is a high-severity vulnerability in Apache Nifi, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-05-08.
- How severe is CVE-2026-39816?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-39816 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.