# CVE-2026-40488

> Vulnerability · severity: **HIGH** (CVSS 8.8).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40488
- **Published:** 2026-04-20
- **CVSS severity:** HIGH
- **CVSS base score:** 8.8
- **CWE codes:** CWE-434

## Affected products

- `openmage:magento`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40488

## Citation

> AI Analytics. CVE-2026-40488. Retrieved 2026-07-05 from https://api.ai-analytics.org/cve/CVE-2026-40488. Derived from NIST NVD. Licensed CC0.

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