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CVE-2026-39816

Apache NiFi: Missing Execute Code Required Permission on TinkerpopClientService

Published: May 8, 2026Updated: May 9, 2026 Sources: CVE List NVD BDUCWE-862
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.8%
Top 49.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-862

Affected Products

Apache NiFiApache Software Foundation
On-premWeb App
Web & CMS Plugins / cms-core
nifiapache
On-premWeb App
Web & CMS Plugins
NiFiApache Software Foundation
Mixed
Web & CMS Plugins / cms-core
apache software foundationoss-projectUSWeb & CMS Pluginsaka apache foundation
apacheoss-projectUSWeb & CMS Pluginsaka apache http server, apache httpd

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
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References

https://lists.apache.org/thread/gh9g7xwvv4l20gzff6q3367snf35ctcb
lists.apache.org
http://www.openwall.com/lists/oss-security/2026/04/13/8
openwall.com
https://zeropath.com/blog/nifi-cve-2026-39816-privesc-rce
zeropath.com
and 2 more references View all →

Timeline

Published
May 8, 2026
Last Updated
May 9, 2026

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