OpenMage LTS has Customer File Upload Extension Blocklist Bypass that Leads to Remote Code Execution
Published Apr 20, 2026
8.7
HIGHCVSS 4.0
EPSS 0.96%
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.
Affected products
-
- Version < 20.17.0StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| OpenMage | Magento-Lts | n/a |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
References (3)
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-3j5q-7q7h-2hhv x_refsource_CONFIRMExploitVendor Advisory
- https://github.com/advisories/GHSA-3j5q-7q7h-2hhv Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-40488
| Link | Providers | Tags |
|---|---|---|
| https://github.com/OpenMage/magento-lts/security/advisories/GHSA-3j5q-7q7h-2hhv | x_refsource_CONFIRMExploitVendor Advisory | |
| https://github.com/advisories/GHSA-3j5q-7q7h-2hhv | Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-40488 |
Change history (0)
No recorded changes yet.