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MEDIUM severity

Magento stored cross-site scripting vulnerability in the admin consoleGHSA-h5rm-m772-6qcx

MEDIUM

GHSA-h5rm-m772-6qcx is a medium-severity (CVSS 4.8) Cross-site Scripting (XSS) vulnerability in magento/community-edition. A fix is available for magento/community-edition — see the affected versions and patch details below.

Also known asBIT-magento-2021-21023CVE-2021-21023
Published
Updated
Affected
3 pkgs
Patched
2 / 3
Exploits
None indexed
Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs76th percentile — riskier than 76% of all scored CVEsHighest risk
0.95%2.11%3.28%4.44%3.8%1.6%May 26Aug 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
🐘magento/community-edition🐘magento/community-edition🐘magento/project-community-edition

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

Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to a stored cross-site scripting vulnerability in the admin console. Successful exploitation could lead to arbitrary JavaScript execution in the victim's browser. Access to the admin console is required for successful exploitation.

Affected Packages

3 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistmagento/community-editionall versions2.3.6composer require magento/community-edition:^2.3.6
🐘Packagistmagento/community-edition≥ 2.4.0&&< 2.4.1-p12.4.1-p1composer require magento/community-edition:^2.4.1-p1
🐘Packagistmagento/project-community-editionall versionsNo fix

Affected Products

1 product · 10 configurations
Application
magentomagento
< 2.3.6
3 versions
2.3.62.4.02.4.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update magento/community-edition to 2.3.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-h5rm-m772-6qcx 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

Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are vulnerable to a stored cross-site scripting vulnerability in the admin console. Successful exploitation could lead to arbitrary JavaScript execution in the victim's browser. Access to the admin console is required for successful exploitation.
O3 Security · Impact-Aware SCA

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Magento stored cross-site scripting vulnerability in the…