Cross-Site Scripting via SVG media files

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.0 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS

• CVE-2021-37710: 0.74% estimated exploitation activity in the next 30 days; percentile 54.50 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact Cross-Site Scripting via SVG media files Patches We recommend updating to the current version 6.4.3.1. You can get the update to 6.4.3.1 regularly via the Auto-Updater or directly via the download overview. https://www.shopware.com/en/download/#shopware-6 Workarounds For older versions of 6.1, 6.2, and 6.3, corresponding security measures are also available via a plugin. For the full range of functions, we recommend updating to the latest Shopware version.

Published by the source

23 Aug 2021, 19:43 UTC

Last modified by the source

1 Feb 2023, 05:06 UTC

Source last checked

26 Oct 2026, 14:04 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-fc38-mxwr-pfhx

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# Patch Next advisory brief: CVE-2021-37710

Advisory: Cross-Site Scripting via SVG media files
IDs: CVE-2021-37710, GHSA-fc38-mxwr-pfhx
Record: https://patchnext.com/advisories/cve-2021-37710 (revision 1, source checked 26 Oct 2026, 14:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: shopware/core 6.4.3.1; shopware/platform 6.4.3.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist shopware/core: affected <= 6.4.3.0; fixed in 6.4.3.1
- Packagist shopware/platform: affected <= 6.4.3.0; fixed in 6.4.3.1

## Suggested inspection (read-only)
- Packagist shopware/core: check the installed version with your package manager.
- Packagist shopware/platform: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on shopware/core, shopware/platform.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-fc38-mxwr-pfhx (GitHub-reviewed advisory GHSA-fc38-mxwr-pfhx lists affected ranges: Packagist shopware/core >=0 =0 <=6.4.3.0)

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