CVE-2021-36026

Magento Commerce versions 2.4.2 (and earlier), 2.4.2-p1 (and earlier) and 2.3.7 (and earlier) are affected by a stored cross-site scripting vulnerability in the customer address upload feature that could be abused by an attacker to inject malicious scripts into vulnerable form fields. Malicious JavaScript may be executed in a victim’s browser when they browse to the page containing the vulnerable field.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

Kodem intelligence

1. What is CVE-2021-36026? CVE-2021-36026 is a medium-severity cross-site scripting (XSS) vulnerability in magento/project-community-edition (composer), affecting versions <= 2.0.2. It is fixed in 2.3.7-p1, 2.4.2-p2. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. Which packages are affected by CVE-2021-36026?
   • magento/project-community-edition (composer) (versions <= 2.0.2)
   • magento/community-edition (composer) (versions < 2.3.7-p1)
3. Is there a fix for CVE-2021-36026? Yes. CVE-2021-36026 is fixed in 2.3.7-p1, 2.4.2-p2. Upgrade to this version or later.
4. Is CVE-2021-36026 exploitable, and should I be worried? Whether CVE-2021-36026 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether CVE-2021-36026 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix CVE-2021-36026?
   • Upgrade magento/community-edition to 2.3.7-p1 or later
   • Upgrade magento/community-edition to 2.4.2-p2 or later

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