CVE-2026-42458 Magento LTS: Reflected XSS - Import -> Data Flow (profiles)
Reflected XSS in Magento LTS admin panel allows attackers to execute scripts in admin sessions, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-42458?
CVE-2026-42458 is a medium-severity cross-site scripting vulnerability in OpenMage magento-lts, published on 15 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-87
Which versions are affected by CVE-2026-42458?
2 open source packages ship an affected version, including openmage/magento-lts.
| Package | Affected | Fixed in |
|---|---|---|
openmage/magento-lts Packagist | All versions | 20.18.0 |
openmage/magento-lts Packagist | All versions | 20.18.0 |
How do I fix CVE-2026-42458?
Upgrade openmage/magento-lts to 20.18.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-42458 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42458 exists.
Sources
Also known as GHSA-x8jv-q8j2-487c.