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MEDIUM severity

Cross site scripting in sylius/syliusGHSA-hhvr-2q69-4563

MEDIUMFix: sylius/sylius@3da169e

GHSA-hhvr-2q69-4563 is a medium-severity (CVSS 4.1) Cross-site Scripting (XSS) vulnerability in sylius/sylius. A fix is available for sylius/sylius — see the affected versions and patch details below.

Also known asCVE-2021-3841
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-hhvr-2q69-4563.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs17th percentile — riskier than 17% of all scored CVEsHighest risk
0.00%0.25%0.50%0.76%0.2%0.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected
🐘sylius/sylius🐘sylius/sylius🐘sylius/sylius

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

sylius/sylius versions prior to 1.9.10, 1.10.11, and 1.11.2 are vulnerable to stored cross-site scripting (XSS) through SVG files. This vulnerability allows attackers to inject malicious scripts that can be executed in the context of the user's browser.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsylius/syliusall versions1.9.10composer require sylius/sylius:^1.9.10
🐘Packagistsylius/sylius≥ 1.10.0&&< 1.10.111.10.11composer require sylius/sylius:^1.10.11
🐘Packagistsylius/sylius≥ 1.11.0&&< 1.11.21.11.2composer require sylius/sylius:^1.11.2

Affected Products

1 product · 3 configurations
Application
syliussylius
≥ 1.11.0 && < 1.11.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for sylius/sylius, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update sylius/sylius to 1.9.10 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hhvr-2q69-4563 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

sylius/sylius versions prior to 1.9.10, 1.10.11, and 1.11.2 are vulnerable to stored cross-site scripting (XSS) through SVG files. This vulnerability allows attackers to inject malicious scripts that can be executed in the context of the user's browser.
O3 Security · Impact-Aware SCA

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Cross site scripting in sylius/sylius (Medium 4.1)