What is CVE-2018-15882?

CVE-2018-15882 is a critical-severity vulnerability in Joomla Joomla\!, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2018-08-29.

How severe is CVE-2018-15882?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Arbitrary file upload in Joomla Joomla\!

CVE-2018-15882

An issue was discovered in Joomla! before 3.8.12. Inadequate checks in the InputFilter class could allow specifically prepared phar files to pass the upload filter.

Vulnerability class: Unrestricted File Upload

Published 2018-08-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Joomla Joomla\!

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

www.securityfocus.com/bid/105166 (VDB Entry, Third Party Advisory, vdb-entry)
developer.joomla.org/security-centre/743-20180801-core-hardening-the-inputfilte… (Vendor Advisory)
www.securitytracker.com/id/1041913 (Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-15882?: CVE-2018-15882 is a critical-severity vulnerability in Joomla Joomla\!, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2018-08-29.
How severe is CVE-2018-15882?: Critical severity. CVSS v3 base score is 9.8 out of 10.