CVE-2021-21030 Magento Commerce Stored Cross-site Scripting Could Lead To Arbitrary Javascript Execution

What is CVE-2021-21030?

CVE-2021-21030 is a high-severity cross-site scripting vulnerability in Magento Magento, published on 11 Feb 2021. An attacker can exploit it over the internet without logging in, 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 (XSS) in the customer address upload feature. Successful exploitation could lead to arbitrary JavaScript execution in the victim's browser. Exploitation of this issue requires user interaction.

Weakness: CWE-79

Which versions are affected by CVE-2021-21030?

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-2021-21030?

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-2021-21030 being exploited?

There is no known exploitation of CVE-2021-21030 in the wild and no public exploit code.

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• CVE-2020-9578 Magento command injection vulnerability Critical 9.8
• CVE-2020-9579 Magento Security mitigation bypass vulnerability Critical 9.8
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All Magento Magento vulnerabilities

Sources

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

Also known as BIT-magento-2021-21030, GHSA-6988-g89m-27vf.