OpenCart 4.2.0.0 Extension Installer path traversal

Summaryinfo

A vulnerability described as critical has been identified in OpenCart 4.2.0.0. The impacted element is an unknown function of the component Extension Installer. Executing a manipulation can lead to path traversal. This vulnerability appears as CVE-2026-18412. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in OpenCart 4.2.0.0. This vulnerability affects an unknown code block of the component Extension Installer. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at kb.cert.org. This vulnerability was named CVE-2026-18412 since 07/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/10/2026). This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• E-Commerce Management Software

Name

• OpenCart

Version

• 4.2.0.0

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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