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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.

PUBLISHED Reserved 2026-04-07 | Published 2026-05-08 | Updated 2026-05-09 | Assigner apache




HIGH: 7.5CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/AU:Y/R:I/V:C/RE:L/U:Green

Problem types

CWE-862 Missing Authorization

Product status

Default status
unaffected

2.0.0-M1 (semver)
affected

Timeline

2026-04-03:reported
2026-04-06:patched

Credits

John Walker from ZeroPath finder

References

www.openwall.com/lists/oss-security/2026/04/13/8

zeropath.com/blog/nifi-cve-2026-39816-privesc-rce

lists.apache.org/thread/gh9g7xwvv4l20gzff6q3367snf35ctcb vendor-advisory

cve.org (CVE-2026-39816)

nvd.nist.gov (CVE-2026-39816)

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