CVE-2026-39816HIGH 8.8EPSS p50.5%

CVE-2026-39816CVE-2026-39816

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.

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS0.76% probability of exploitation · percentile 50.5% · 2026-06-19T12:03:05Z
Published2026-05-08
Last modified2026-05-09

Underlying weaknesses· 1

CWE-862

References

  1. https://lists.apache.org/thread/gh9g7xwvv4l20gzff6q3367snf35ctcb
  2. http://www.openwall.com/lists/oss-security/2026/04/13/8
  3. https://zeropath.com/blog/nifi-cve-2026-39816-privesc-rce

1

TypeTargetConfidenceTier
WeaknessMissing Authorizationcwe-8620%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.