What is CVE-2020-16254?

CVE-2020-16254 is a medium-severity vulnerability in Chartkick Project, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.1/10. Published 2020-08-05.

How severe is CVE-2020-16254?

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

Vulnerability in Chartkick Project

CVE-2020-16254

The Chartkick gem through 3.3.2 for Ruby allows Cascading Style Sheets (CSS) Injection (without attribute).

Published 2020-08-05 · 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: 0.008 (53.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.5% 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

Chartkick Project

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

github.com/ankane/chartkick (Third Party Advisory)
github.com/ankane/chartkick/issues/546 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-16254?: CVE-2020-16254 is a medium-severity vulnerability in Chartkick Project, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.1/10. Published 2020-08-05.
How severe is CVE-2020-16254?: Medium severity. CVSS v3 base score is 6.1 out of 10.