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🛡️ CVE-2026-48015 — core

🟡 CVSS 4.9 — Medium ✅ No Known Exploit CWE-79 NVD
4.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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:

```yaml

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:

1. Remove SVG from allowed_extensions if SVG upload is not a core requirement

2. Sanitize SVG content on upload using a library like enshrined/svg-sanitize (strips scripts, event handlers, external references)

3. Serve SVGs with Content-Disposition: attachment to prevent inline rendering

4. 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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: High — administrative rights are needed first.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2026-48015 is classified as CWE-79: Cross-site Scripting (XSS). User-supplied data is written into a page without escaping, so attacker script runs in the browser of anyone who views it.

Affected software

CVE-2026-48015 is recorded against 3 packages.

  • shopware/core (fixed in 6.6.10.18)
  • shopware/platform (fixed in 6.6.10.18)
  • unknown

Timeline and source

Published on 4 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Package)
github.com (Web)
github.com (Web)

Other advisories for this package

shopware/core has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-79: Cross-site Scripting (XSS)) in other software:

Details

Severity Medium
CVSS Score 4.9
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2026-06-04
Updated 2026-08-20
Modified 2026-06-04
Fix URL N/A

Affected Packages

Software From version Fixed in
shopware/core — 6.6.10.18
shopware/platform — 6.6.10.18
unknown — —

Similar Threats

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