How severe is CVE-2026-42458?

CVE-2026-42458 has a CVSS 4.0 base score of 5.3, rated medium severity.

Is CVE-2026-42458 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42458?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42458 have an EU (EUVD) identifier?

Yes. CVE-2026-42458 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30575.

When was CVE-2026-42458 published?

CVE-2026-42458 was published on 2026-05-15 and last updated on 2026-06-17.

CVE-2026-42458

CVE-2026-42458 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-87.

Key facts

Severity: Medium (CVSS 4.0 base score 5.3)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30575
Weakness: CWE-87
Published: 2026-05-15
Last modified: 2026-06-17

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 20.18.0, there is a reflected XSS vulnerability under admin panel -> System -> Import/Export -> Dataflow - Profiles. This vulnerability is fixed in 20.18.0.

Frequently asked questions

What is CVE-2026-42458?: 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 20.18.0, there is a reflected XSS vulnerability under admin panel -> System -> Import/Export -> Dataflow - Profiles. This vulnerability is fixed in 20.18.0.
How severe is CVE-2026-42458?: CVE-2026-42458 has a CVSS 4.0 base score of 5.3, rated medium severity.
Is CVE-2026-42458 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42458?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42458 have an EU (EUVD) identifier?: Yes. CVE-2026-42458 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30575.
When was CVE-2026-42458 published?: CVE-2026-42458 was published on 2026-05-15 and last updated on 2026-06-17.

References

https://github.com/OpenMage/magento-lts/security/advisories/GHSA-x8jv-q8j2-487c

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