CVE-2026-39816

HIGH

8.8

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.

CVE Details

CVSS v3.1 Score8.8

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published5/8/2026

Last Modified5/9/2026

Sourcenvd

Honeypot Sightings0

Affected Products

apache:nifi

Weaknesses (CWE)

CWE-862

References

https://lists.apache.org/thread/gh9g7xwvv4l20gzff6q3367snf35ctcb(security@apache.org)

http://www.openwall.com/lists/oss-security/2026/04/13/8(af854a3a-2127-422b-91ae-364da2661108)

https://zeropath.com/blog/nifi-cve-2026-39816-privesc-rce(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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