CVE-2020-13971
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn Shopware before 6.2.3, authenticated users are allowed to use the Mediabrowser fileupload feature to upload SVG images containing JavaScript. This leads to Persistent XSS. An uploaded image can be accessed without authentication.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceIn Shopware before 6.2.3, the Mediabrowser fileupload feature allows authenticated users to upload SVG images containing embedded JavaScript. Since SVG files can contain executable scripts, this leads to persistent cross-site scripting (XSS). Additionally, uploaded images are accessible without authentication, allowing the malicious payload to be executed by any user who accesses the uploaded SVG file.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 6.2.3CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed Shopware versionLocate the version file or admin panel to identify the current Shopware installation versionAffected if The installed version is lower than 6.2.3 (e.g., 6.2.2, 6.2.1, 6.1.x, etc.)
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Verify Mediabrowser upload functionality is accessibleConfirm that the Mediabrowser file upload feature is available to authenticated users in the admin panel or via APIAffected if The Mediabrowser upload feature is enabled and accessible to users with media library permissions
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Test SVG upload capabilityAttempt to upload an SVG file through the Mediabrowser interface or upload endpoint to see if the file type is acceptedAffected if SVG files can be uploaded without being blocked or rejected by the upload validation
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Inspect uploaded SVG files for sanitizationUpload a test SVG file containing JavaScript (e.g., <script> tags or event handlers) and then retrieve/download the file to verify whether the script was removed or preservedAffected if The uploaded SVG file retains embedded JavaScript code when accessed again
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Check media file access controlsAccess a previously uploaded SVG file via direct URL (without authentication) to verify if the file is publicly accessibleAffected if Uploaded media files, including SVG files, are accessible without authentication
The environment is affected if running Shopware version below 6.2.3 AND the Mediabrowser allows SVG uploads that retain embedded JavaScript AND those files are accessible without authentication.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data6.2.3
Upgrade to Shopware 6.2.3 or later, which includes proper SVG sanitization. Alternatively, implement server-side validation to strip or block JavaScript from uploaded SVG files before storage.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-13971 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-13971 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data