Improper Neutralization of Alternate XSS Syntax in magento-lts - CVE-2026-42458
Published: May 5, 2026
Vulnerability identifier: #VU129646
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42458
CWE-ID: CWE-87
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in the administrator's browser.
The vulnerability exists due to improper neutralization of alternate XSS syntax in the Import -> Data Flow (profiles) run functionality when rendering a user-controlled filename in the run profile page. A remote user can upload or reference a specially crafted filename to execute arbitrary script in the administrator's browser.
The issue is reachable in the admin panel during Import profile execution.
Affected software
magento-lts
How to mitigate CVE-2026-42458
Install security update from vendor's website.
magento-lts - update to 20.18.0