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CVE-2026-18412

—1
CVSS 3.1
9.1 critical
EPSS
<1%p37
Published
()
Modified
Description

OpenCart extensions are uploaded as zip files with .ocmod.zip extensions. Upon installation, the OpenCart v4.2.0.0 extension installer extracts these zip files, but does not validate that the extracted paths stay inside the intended extraction directory. An attacker can craft a malicious extension containing file path traversal sequences, such as ../. With this vulnerability, an attacker can write files, such as a PHP web shell, into the webroot directory.

Ecosystems
E-commerce
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD CVE.org GitHub PoCs EPSS (0.4%)

In the news

VU#614868: OpenCart ecommerce platform contains directory traversal vulnerability

OpenCart 4.2.0.0 extension installer fails to validate zip extraction paths, allowing directory traversal (CVE-2026-18412) to write files outside intended directories.

CERT/CC VU#614868 discloses CVE-2026-18412, a directory traversal vulnerability in OpenCart v4.2.0.0's extension installer. The installer extracts uploaded .ocmod.zip files using zip entry filenames as filesystem paths without verifying the resolved path stays inside the intended directory. A malicious extension zip could result in arbitrary file writes outside the target directory.

CERT/CC Vulnerability Notes · Aug 10, 2026VulnerabilityCVE-2026-184121