What is CVE-2018-17193?

CVE-2018-17193 is a medium-severity vulnerability in Apache Nifi, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-19.

How severe is CVE-2018-17193?

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

XSS in Apache Nifi

CVE-2018-17193

The message-page.jsp error page used the value of the HTTP request header X-ProxyContextPath without sanitization, resulting in a reflected XSS attack. Mitigation: The fix to correctly parse and sanitize the request attribute value was applied on the Apache NiFi 1.8.0 release. Users running a prior 1.x release should upgrade to the appropriate release.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-12-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.028 (85.7th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 85.7% 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 - 1.7.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2018-17193?: CVE-2018-17193 is a medium-severity vulnerability in Apache Nifi, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-12-19.
How severe is CVE-2018-17193?: Medium severity. CVSS v3 base score is 6.1 out of 10.