Is CVE-2026-40488 actively exploited?

No active exploitation of CVE-2026-40488 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40488 be exploited remotely?

Yes. CVE-2026-40488 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40488?

CVE-2026-40488 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2026-40488

CWE-434Published: April 20, 2026· Updated: Apr 23, 2026

8.8

CVSS v3.1

EPSS:0.12%probability of exploitation in 30 daysPercentile:30.6th

Official Description

Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Magento Community Edition e-commerce platform with a high level of backward compatibility. Prior to version 20.17.0, the product custom option file upload in OpenMage LTS uses an incomplete blocklist (`forbidden_extensions = php,exe`) to prevent dangerous file uploads. This blocklist can be trivially bypassed by using alternative PHP-executable extensions such as `.phtml`, `.phar`, `.php3`, `.php4`, `.php5`, `.php7`, and `.pht`. Files are stored in the publicly accessible `media/custom_options/quote/` directory, which lacks server-side execution restrictions for some configurations, enabling Remote Code Execution if this directory is not explicitly denied script execution. Version 20.17.0 patches the issue.

NVD Source

Technical Analysis

CVE-2026-40488 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.