Is CVE-2026-40488 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-40488 being exploited in the wild.

How severe is CVE-2026-40488?

High severity, with a CVSS score of 8.8, published 20 April 2026.

Which products and versions are affected?

openmage/magento-lts (Packagist) <= 20.16.0, ECOSYSTEM:introduced=0,fixed=20.17.0.

Is there a fix for CVE-2026-40488?

Yes. openmage/magento-lts (Packagist): upgrade to 20.17.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Am I affected by CVE-2026-40488?

Check whether you run OpenMage Magento or openmage/magento-lts (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

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

Q: Is there a fix for CVE-2026-40488?

Yes. openmage/magento-lts (Packagist): upgrade to 20.17.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: Am I affected by CVE-2026-40488?

Check whether you run OpenMage Magento or openmage/magento-lts (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-40488 · Severity: high · CVSS 8.8 · Published 2026-04-20

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.

Technologies: OpenMage Magento, openmage/magento-lts (Packagist). Vendors: OpenMage, Packagist.

Quick answers

Is CVE-2026-40488 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-40488 being exploited in the wild.
How severe is CVE-2026-40488?: High severity, with a CVSS score of 8.8, published 20 April 2026.
Which products and versions are affected?: openmage/magento-lts (Packagist) <= 20.16.0, ECOSYSTEM:introduced=0,fixed=20.17.0.
Is there a fix for CVE-2026-40488?: Yes. openmage/magento-lts (Packagist): upgrade to 20.17.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-40488?: Check whether you run OpenMage Magento or openmage/magento-lts (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

openmage/magento-lts (Packagist): upgrade to 20.17.0 or later
```
composer require openmage/magento-lts:^20.17.0
```

Affected products

OpenMage Magento
openmage/magento-lts (Packagist) <= 20.16.0, ECOSYSTEM:introduced=0,fixed=20.17.0

Identifiers

CVE-2026-40488
GHSA-3j5q-7q7h-2hhv

References

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