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LOW severity

Magento LTS vulnerable to stored XSS in theme config fieldsGHSA-5pxh-89cx-4668

LOWFix: OpenMage/magento-lts@d307e5b

GHSA-5pxh-89cx-4668 is a low-severity (CVSS 2.9) Cross-site Scripting (XSS) vulnerability in openmage/magento-lts. A fix is available for openmage/magento-lts — see the affected versions and patch details below.

Also known asCVE-2025-27400
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-5pxh-89cx-4668.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs17th percentile — riskier than 17% of all scored CVEsHighest risk
0.00%0.25%0.50%0.76%0.1%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘openmage/magento-lts

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

As reported by Aakash Adhikari, 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.

image

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistopenmage/magento-ltsall versions20.12.3composer require openmage/magento-lts:^20.12.3

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for openmage/magento-lts, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update openmage/magento-lts to 20.12.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-5pxh-89cx-4668 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

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. ![image](https://github.com/user
O3 Security · Impact-Aware SCA

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Magento LTS vulnerable to stored XSS in theme config…