GHSA-5pxh-89cx-4668
Magento LTS vulnerable to stored XSS in theme config fields
Quick fix
GHSA-5pxh-89cx-4668 — openmage/magento-lts: upgrade to the fixed version with the command below.
composer require openmage/magento-lts:^20.12.3Details
As reported by [Aakash Adhikari](https://hackerone.com/dark_haxor), Github: @justlife4x4, the Design > Themes > Skin (Images / CSS) config field allows a Stored XSS when it contains an end script tag.
### Impact A malicious user with access to this configuration field could use a Stored XSS to affect other authenticated admin users in the admin panel.
The attack requires an admin user with configuration access, so in practice, it is not very likely to be used for gaining elevated privileges, although it could theoretically be used to impersonate other users.
Are you affected?
Enter the version of the package you're using.
Affected packages
0Fixed in: 20.12.3composer require openmage/magento-lts:^20.12.3References
- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-5pxh-89cx-4668[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2025-27400[ADVISORY]
- https://github.com/OpenMage/magento-lts/commit/d307e5bf75729a2347dde0952fe9fd9fcd9c6aea[WEB]
- https://github.com/OpenMage/magento-lts[PACKAGE]
- https://github.com/OpenMage/magento-lts/releases/tag/v20.12.3[WEB]
- https://github.com/OpenMage/magento-lts/releases/tag/v20.13.0[WEB]