What is CVE-2018-16234?

CVE-2018-16234 is a medium-severity vulnerability in Morningstarsecurity Whatweb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-08-30.

How severe is CVE-2018-16234?

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

XSS in Morningstarsecurity Whatweb

CVE-2018-16234

MorningStar WhatWeb 0.4.9 has XSS via JSON report files.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-08-30 · 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: 0.008 (56.6th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Morningstarsecurity Whatweb — versions 0.4.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/urbanadventurer/WhatWeb/issues/261 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-16234?: CVE-2018-16234 is a medium-severity vulnerability in Morningstarsecurity Whatweb, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-08-30.
How severe is CVE-2018-16234?: Medium severity. CVSS v3 base score is 6.1 out of 10.