What is CVE-2018-6379?

CVE-2018-6379 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-01-30.

How severe is CVE-2018-6379?

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

XSS in Joomla Joomla\!

CVE-2018-6379

In Joomla! before 3.8.4, inadequate input filtering in the Uri class (formerly JUri) leads to an XSS vulnerability.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-01-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.017 (75.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Joomla Joomla\!

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.securitytracker.com/id/1040316 (VDB Entry, Third Party Advisory, vdb-entry)
developer.joomla.org/security-centre/721-20180104-core-xss-vulnerability.html (Vendor Advisory)
www.securityfocus.com/bid/102918 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-6379?: CVE-2018-6379 is a medium-severity vulnerability in Joomla Joomla\!, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-01-30.
How severe is CVE-2018-6379?: Medium severity. CVSS v3 base score is 6.1 out of 10.