Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Nifi | >= 2.0.0, < 2.9.0 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/gh9g7xwvv4l20gzff6q3367snf35ctcbMailing ListVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/13/8Mailing ListThird Party Advisory
- https://zeropath.com/blog/nifi-cve-2026-39816-privesc-rce
FAQ
What is CVE-2026-39816?
CVE-2026-39816 is a vulnerability with a CVSS score of 8.8 (HIGH). 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...
How severe is CVE-2026-39816?
CVE-2026-39816 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39816?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Nifi.