CVE-2021-28556 Magento Commerce DOM-based cross-site scripting (XSS) could lead to arbitrary javascript execution

What is CVE-2021-28556?

CVE-2021-28556 is a medium-severity cross-site scripting vulnerability in Magento Magento, published on 28 Jun 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 2.4.2 (and earlier), 2.4.1-p1 (and earlier) and 2.3.6-p1 (and earlier) are affected by a DOM-based Cross-Site Scripting vulnerability on mage-messages cookies. Successful exploitation could lead to arbitrary JavaScript execution by an unauthenticated attacker. User interaction is required for successful exploitation.

Weakness: CWE-79

Which versions are affected by CVE-2021-28556?

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-2021-28556?

Upgrade magento/community-edition to a fixed version for your release line: 2.3.7 or 2.4.2-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-2021-28556 being exploited?

There is no known exploitation of CVE-2021-28556 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-2021-28556, GHSA-39ch-rg26-gmq5.