What is CVE-2021-3920?

CVE-2021-3920 is a medium-severity vulnerability in Getgrav Getgrav/grav-Plugin-Admin, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-11-19.

How severe is CVE-2021-3920?

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

XSS in Getgrav Getgrav/grav-Plugin-Admin

CVE-2021-3920

grav-plugin-admin is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-11-19 · 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: 0.014 (70.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.014 · change: +0.000

Affected products

Getgrav Getgrav/grav-Plugin-Admin — versions unspecified
Getgrav Grav-Plugin-Admin

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

huntr.dev/bounties/ab564760-90c6-4e1d-80c2-852f45034cd1 (Exploit, Third Party Advisory)
github.com/getgrav/grav-plugin-admin/commit/6463135bf046d8131189c163158cd5db8f7… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-3920?: CVE-2021-3920 is a medium-severity vulnerability in Getgrav Getgrav/grav-Plugin-Admin, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2021-11-19.
How severe is CVE-2021-3920?: Medium severity. CVSS v3 base score is 5.4 out of 10.