What is CVE-2018-18942?

CVE-2018-18942 is a high-severity vulnerability in Basercms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2018-11-05.

How severe is CVE-2018-18942?

High severity. CVSS v3 base score is 7.2 out of 10.

Arbitrary file upload in Basercms

CVE-2018-18942

In baserCMS before 4.1.4, lib\Baser\Model\ThemeConfig.php allows remote attackers to execute arbitrary PHP code via the admin/theme_configs/form data[ThemeConfig][logo] parameter.

Vulnerability class: Unrestricted File Upload

Published 2018-11-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.024 (83.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Basercms

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

github.com/baserproject/basercms/issues/959 (Third Party Advisory, Issue Tracking)
sunu11.com/2018/10/31/baserCMS/ (Exploit, Third Party Advisory)
basercms.net/release/4_1_4 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2018-18942?: CVE-2018-18942 is a high-severity vulnerability in Basercms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.2/10. Published 2018-11-05.
How severe is CVE-2018-18942?: High severity. CVSS v3 base score is 7.2 out of 10.