PatchSiren cyber security CVE debrief

CVE-2026-42458 OpenMage CVE debrief

A reflected cross-site scripting (XSS) vulnerability exists in Magento Long Term Support (LTS), a community-driven fork of Magento Community Edition. The flaw resides in the admin panel's Dataflow - Profiles functionality (System → Import/Export → Dataflow - Profiles) and was present in all versions prior to 20.18.0. An attacker could exploit this vulnerability by crafting a malicious URL containing JavaScript payloads that execute in the context of an authenticated administrator's browser session when visited. Successful exploitation requires user interaction (an admin clicking a malicious link) and could lead to session hijacking, privilege escalation, or unauthorized administrative actions. The vulnerability has been remediated in version 20.18.0.

Vendor: OpenMage
Product: magento-lts
CVSS: MEDIUM 5.3
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-05-15
Original CVE updated: 2026-05-18
Advisory published: 2026-05-15
Advisory updated: 2026-05-18

Who should care

Organizations running Magento LTS (OpenMage) versions prior to 20.18.0, particularly those with multiple administrative users or exposed admin panels. E-commerce security teams, Magento developers, and system administrators responsible for patch management should prioritize this update.

Technical summary

Reflected XSS in Magento LTS admin panel Dataflow - Profiles (System → Import/Export). Affects versions < 20.18.0. Fixed in 20.18.0. CVSS 4.0: AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N. CWE-87.

Defensive priority

medium

Recommended defensive actions

Upgrade Magento LTS to version 20.18.0 or later to remediate this vulnerability.
Implement Content Security Policy (CSP) headers to mitigate XSS impact in administrative interfaces.
Apply principle of least privilege for admin panel access and require multi-factor authentication for administrative accounts.
Review web application firewall (WAF) rules to detect and block reflected XSS payloads in Dataflow profile parameters.
Audit admin panel access logs for suspicious requests to /admin/system/convert_profile/ endpoints containing script tags or event handlers.

Evidence notes

The vulnerability description and affected version range are derived from the official CVE record and GitHub Security Advisory. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, and user interaction required, with low impacts to confidentiality and integrity of the vulnerable system. The weakness is classified as CWE-87 (Improper Neutralization of Alternate XSS Syntax).

Official resources

2026-05-15T17:16:46.900Z