What is CVE-2020-1933?

CVE-2020-1933 is a medium-severity vulnerability in Apache Nifi, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-28.

How severe is CVE-2020-1933?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Apache Nifi

CVE-2020-1933

A XSS vulnerability was found in Apache NiFi 1.0.0 to 1.10.0. Malicious scripts could be injected to the UI through action by an unaware authenticated user in Firefox. Did not appear to occur in other browsers.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-01-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.028 (86.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000

Affected products

Apache Nifi
Apache Software Foundation Nifi — versions Apache NiFi 1.0.0 to 1.10.0
Mozilla Firefox

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

nifi.apache.org/security.html (Vendor Advisory)

Frequently asked questions

What is CVE-2020-1933?: CVE-2020-1933 is a medium-severity vulnerability in Apache Nifi, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-01-28.
How severe is CVE-2020-1933?: Medium severity. CVSS v3 base score is 6.1 out of 10.