Missing Authorization in Apache Nifi - CVE-2026-39816
Published: August 25, 2026 / Updated: September 4, 2026
Vulnerability identifier: #VU145318
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-39816
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
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.
Affected software
Apache Nifi
How to mitigate CVE-2026-39816
Install security update from vendor's website.
Apache Nifi - update to 2.9.0