CVE-2026-40488: Magento Long Term Support (LTS) is an unofficial, community-driven project provides an alternative to the Mage

Q: How do I fix CVE-2026-40488?

magento: upgrade to 20.17.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-40488 being exploited?

CVE-2026-40488 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40488 affect?

CVE-2026-40488 affects magento. Severity is high (CVSS 8.8). 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 custo

Q: How urgent is CVE-2026-40488?

Priority 49/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2026-40488 is a high-severity flaw (CVSS 8.8) affecting magento. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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-executab

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-434
Published	2026-04-20
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: openmage

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-20 17:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

openmage magento UPGRADE

Affected: < 20.17.0

Fixed in: 20.17.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy magento || rpm -q magento || magento --version

2. UPGRADE to 20.17.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade magento

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade magento

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40488?

magento: upgrade to 20.17.0. Exact commands for each OS are on this page.

Is CVE-2026-40488 being exploited?

CVE-2026-40488 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40488 affect?

CVE-2026-40488 affects magento. Severity is high (CVSS 8.8). 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 custo

How urgent is CVE-2026-40488?

Priority 49/100. High severity; Public exploit reference

Software pages

PHP vulnerabilities · Magento vulnerabilities

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References

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