What is CVE-2026-40488?

CVE-2026-40488 is a high-severity vulnerability in Openmage Magento, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-04-20.

How severe is CVE-2026-40488?

High severity. CVSS v3 base score is 8.8 out of 10.

Arbitrary file upload in Openmage Magento

CVE-2026-40488

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.

Vulnerability class: Unrestricted File Upload

EPSS: 0.007 (50.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Openmage Magento
Openmage Magento-lts — versions < 20.17.0

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40488?: CVE-2026-40488 is a high-severity vulnerability in Openmage Magento, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2026-04-20.
How severe is CVE-2026-40488?: High severity. CVSS v3 base score is 8.8 out of 10.