What is CVE-2026-54665?

CVE-2026-54665 is a medium-severity vulnerability in Apache Nifi, classified under Origin Validation Error. CVSS score: 5.3/10. Published 2026-06-22.

How severe is CVE-2026-54665?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Apache Nifi

CVE-2026-54665

Apache NiFi 0.0.1 through 2.9.0 support building qualified URLs from one of several HTTP request headers that provide an alternative to the standard Host header without validating the values provided. Apache NiFi 1.6.0 introduced a configu…

EPSS: 0.003 (18.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Apache Nifi
Apache Software Foundation Nifi — versions 0.0.1

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-54665?: CVE-2026-54665 is a medium-severity vulnerability in Apache Nifi, classified under Origin Validation Error. CVSS score: 5.3/10. Published 2026-06-22.
How severe is CVE-2026-54665?: Medium severity. CVSS v3 base score is 5.3 out of 10.