CVE-2021-21023 Magento Commerce Stored Cross Site Scripting Vulnerability Could Lead To Arbitrary Code Execution

What is CVE-2021-21023?

CVE-2021-21023 is a medium-severity cross-site scripting vulnerability in Magento Magento, published on 11 Feb 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2021-21023?

7 open source packages ship an affected version, including magento/community-edition, magento and magento/project-community-edition. It affects 1 product.

Products include Magento Magento.

How do I fix CVE-2021-21023?

Upgrade magento/community-edition to a fixed version for your release line: 2.3.6 or 2.4.1-p1.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-21023 being exploited?

There is no known exploitation of CVE-2021-21023 in the wild and no public exploit code.

Other vulnerabilities in Magento Magento

• CVE-2020-9664 Magento php object injection vulnerability Critical 9.8
• CVE-2020-9576 Magento command injection vulnerability Critical 9.8
• CVE-2020-9578 Magento command injection vulnerability Critical 9.8
• CVE-2020-9579 Magento Security mitigation bypass vulnerability Critical 9.8
• CVE-2020-9580 Magento Security mitigation bypass vulnerability Critical 9.8

All Magento Magento vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-magento-2021-21023, GHSA-h5rm-m772-6qcx.