CVE-2021-37710Network attack vector

Stored script execution via case-sensitive SVG filtering

Published Aug 16, 2021 · Updated Aug 4, 2024

Cross-site scripting in Shopware Platform 6.4.3.0 and earlier allows remote authenticated users to execute script via uploaded SVG media files. The Apache rule in public/.htaccess.dist matches only lowercase .svg names, so uppercase or mixed-case SVG extensions bypass the script-src 'none' CSP header. Media-upload privileges and a victim viewing the stored file are required, and successful exploitation runs attacker-controlled script in the victim's browser.

CVSS severity5.4
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in Shopware Platform 6.4.3.0 and earlier allows remote authenticated users to execute script via uploaded SVG media files. The Apache rule in public/.htaccess.dist matches only lowercase .svg names, so uppercase or mixed-case SVG extensions bypass the script-src 'none' CSP header. Media-upload privileges and a victim viewing the stored file are required, and successful exploitation runs attacker-controlled script in the victim's browser.

The record

CVE
CVE-2021-37710
Published
Aug 16, 2021
Updated
Aug 4, 2024
Vendor
Shopware
Product
Shopware Platform
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 6.4.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shopware · Shopware Platformversion=<= 6.4.3.0

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo