What is CVE-2024-21725?

CVE-2024-21725 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2024-02-29.

How severe is CVE-2024-21725?

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

XSS in Joomla Joomla\!

CVE-2024-21725

Inadequate escaping of mail addresses lead to XSS vulnerabilities in various components.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2024-02-29 · 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: 0.322 (98.3th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.322 · newest: 0.322 · change: 0.000

Affected products

Joomla Joomla\!
Joomla! Project Cms — versions 4.0.0-4.4.2, 5.0.0-5.0.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

developer.joomla.org/security-centre/928-20240204-core-xss-in-mail-address-outp… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2024-21725?: CVE-2024-21725 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2024-02-29.
How severe is CVE-2024-21725?: Medium severity. CVSS v3 base score is 6.1 out of 10.