CVE-2026-40488: OpenMage LTS: Customer File Upload Extension Blocklist Bypass → Remote Code Execution

April 21, 2026 (updated April 27, 2026)

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.

References

Code Behaviors & Features

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