Shopware: Stored XSS via SVG file upload — no SVG sanitization
SVG files are in the allowed_extensions whitelist and can be uploaded by any admin user via the media manager. There is zero SVG content sanitization anywhere in the upload pipeline. A malicious SVG with JavaScript (onload, <script>, <foreignObject>) executes in the context of the Shopware domain when accessed.
The Problem
In src/Core/Framework/Resources/config/packages/shopware.yaml, line 194:
allowed_extensions: ["jpg", "jpeg", "png", "webp", "avif", "gif", "svg", ...]SVG is whitelisted. The upload path (MediaUploadController → FileSaver → TypeDetector) recognizes SVG as ImageType with VECTOR_GRAPHIC flag, but no code strips JavaScript, event handlers, or external entity references from the SVG XML.
A search of the entire codebase for SVG sanitization returns — no DOMPurify, no svg-sanitize, no strip_tags on SVG content, nothing.
Impact
Stored XSS affecting all users who view the uploaded SVG. In an e-commerce context, this can lead to admin account takeover, customer data theft, or malicious plugin installation.
Suggested Fix
Either:
- Remove SVG from
allowed_extensionsif SVG upload is not a core requirement - Sanitize SVG content on upload using a library like
enshrined/svg-sanitize(strips scripts, event handlers, external references) - Serve SVGs with
Content-Disposition: attachmentto prevent inline rendering - Serve SVGs from a separate domain (like Nextcloud's
usercontent.apps.nextcloud.com)
Option 2 is the most practical — enshrined/svg-sanitize is already used by WordPress and other PHP projects.
Regards & BG, Keyvan Hardani
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | shopware/core | >= 6.7.0.0, < 6.7.10.1, < 6.6.10.18 | 6.7.10.1, 6.6.10.18 |
| Composer package | shopware/platform | >= 6.7.0.0, < 6.7.10.1, < 6.6.10.18 | 6.7.10.1, 6.6.10.18 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
shopware/core, shopware/platform- Disclosed
- 04.06.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-xvhc-gm7j-mhmc - CC BY 4.0
Vulnerability history: shopware/platform
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 70
- First → latest
- 09.2020 06.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 6
- High 16
- Medium 33
- Low 15
Disclosures per year
- 2020: 7
- 2021: 17
- 2022: 9
- 2023: 6
- 2024: 8
- 2025: 11
- 2026: 12
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Shopware: Stored XSS via SVG file upload — no SVG sanitization this entry
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