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MEDIUM severity

Magento Improper Access ControlGHSA-2j6v-829g-885q

MEDIUM

GHSA-2j6v-829g-885q is a medium-severity (CVSS 5.3) CWE-284 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-2021-21020CVE-2021-21020
Published
Updated
Affected
3 pkgs
Patched
2 / 3
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.4%probability of exploitation in next 30 days
Lower Risk-0.06%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
0.00%1.04%2.07%3.11%0.1%2.4%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
🐘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 an access control bypass vulnerability in the Login as Customer module. Successful exploitation could lead to unauthorized access to restricted resources.

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-2j6v-829g-885q is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

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 an access control bypass vulnerability in the Login as Customer module. Successful exploitation could lead to unauthorized access to restricted resources.
O3 Security · Impact-Aware SCA

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Magento Improper Access Control (Medium 5.3)