What is CVE-2020-23721?

CVE-2020-23721 is a medium-severity vulnerability in Thedaylightstudio Fuel Cms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-03-10.

How severe is CVE-2020-23721?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Thedaylightstudio Fuel Cms

CVE-2020-23721

An issue was discovered in FUEL CMS V1.4.7. An attacker can use a XSS payload and bypass a filter via /fuelCM/fuel/pages/edit/1?lang=english.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-03-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Thedaylightstudio Fuel Cms — versions 1.4.7

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/daylightstudio/FUEL-CMS/issues/559 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-23721?: CVE-2020-23721 is a medium-severity vulnerability in Thedaylightstudio Fuel Cms, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-03-10.
How severe is CVE-2020-23721?: Medium severity. CVSS v3 base score is 5.4 out of 10.