What is CVE-2021-23131?

CVE-2021-23131 is a high-severity vulnerability in Joomla Joomla\!, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2021-03-04.

How severe is CVE-2021-23131?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Joomla Joomla\!

CVE-2021-23131

An issue was discovered in Joomla! 3.2.0 through 3.9.24. Missing input validation within the template manager.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-03-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.014 (70.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.7% 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

Joomla Joomla\!
Joomla! Project Cms — versions 3.2.0-3.9.24

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

developer.joomla.org/security-centre/845-20210305-core-input-validation-within-… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-23131?: CVE-2021-23131 is a high-severity vulnerability in Joomla Joomla\!, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2021-03-04.
How severe is CVE-2021-23131?: High severity. CVSS v3 base score is 7.5 out of 10.