What is CVE-2018-17858?

CVE-2018-17858 is a high-severity vulnerability in Joomla Joomla\!, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2018-10-09.

How severe is CVE-2018-17858?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Joomla Joomla\!

CVE-2018-17858

An issue was discovered in Joomla! before 3.8.13. com_installer actions do not have sufficient CSRF hardening in the backend.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2018-10-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.7th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Joomla Joomla\!

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

www.securityfocus.com/bid/105559 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1041914 (VDB Entry, Third Party Advisory, vdb-entry)
developer.joomla.org/security-centre/755-20181005-core-csrf-hardening-in-com-in… (Vendor Advisory)

Frequently asked questions

What is CVE-2018-17858?: CVE-2018-17858 is a high-severity vulnerability in Joomla Joomla\!, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2018-10-09.
How severe is CVE-2018-17858?: High severity. CVSS v3 base score is 8.8 out of 10.