SB20260825104 - Missing Authorization in Apache Nifi

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Authorization (CVE-ID: CVE-2026-39816)

CWE-ID: CWE-862 - Missing Authorization

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to execute arbitrary code.

The vulnerability exists due to improper access control in TinkerpopClientService when configuring bytecode submission for the script submission type. A remote user can configure the service to execute Groovy script code to execute arbitrary code.

Only installations that use fine-grained authorization and have the optional nifi-other-graph-services-nar extension installed are vulnerable.

Remediation

Install update from vendor's website.

References

• https://lists.apache.org/api/email.lua?id=xnx23t6so8c674sh9f5ofz5k08rg4hcp
• https://issues.apache.org/jira/browse/NIFI-15800