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Not in CISA KEV
HIGH severity

CVE-2018-18942 — basercms

HIGH

CVE-2018-18942 is a high-severity (CVSS 7.2) Unrestricted File Upload vulnerability in baserproject/basercms. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for baserproject/basercms — see the affected versions and patch details below.

RCE in baserCMS before 4.1.4

Also known asGHSA-rjc2-x53r-6c9r
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
0.43%1.25%2.08%2.90%1.0%2.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘baserproject/basercms

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistbaserproject/basercmsall versions4.1.4composer require baserproject/basercms:^4.1.4

Affected Products

1 product · 1 configurations
Application
basercmsbasercms
< 4.1.4
range
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

In baserCMS before 4.1.4, lib\Baser\Model\ThemeConfig.php allows remote …

sunu11.comNVDAug 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for baserproject/basercms, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update baserproject/basercms to 4.1.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-18942 is resolved across your whole dependency graph.

  3. Workarounds

    Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2018-18942: basercms — Fixed in 4.1.4