CVE-2021-36027 in Magento Commerce
Summary
by MITRE • 09/01/2021
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 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.
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Analysis
by VulDB Data Team • 09/04/2021
This vulnerability exists within Magento Commerce platforms where attackers can exploit stored cross-site scripting flaws to inject malicious JavaScript code into form fields that are subsequently rendered on web pages. The vulnerability affects specific versions including 2.4.2 and earlier, 2.4.2-p1 and earlier, and 2.3.7 and earlier, making it a widespread issue across multiple release branches of the e-commerce platform. The flaw allows malicious actors to persistently inject scripts that execute in the context of victim browsers when they navigate to pages containing the compromised form fields.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the Magento Commerce application. When users submit data through forms, the application fails to properly sanitize or escape potentially malicious content before storing and rendering it in subsequent web pages. This creates a persistent XSS attack vector where the injected scripts can execute with the privileges of the victim user, potentially leading to session hijacking, credential theft, or further exploitation of the compromised system. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with a foothold for more sophisticated attacks within the Magento environment. An attacker could potentially steal customer session cookies, access sensitive customer data, modify product information, or redirect users to malicious sites. The persistent nature of stored XSS means that the malicious scripts remain active until manually removed from the application's database, allowing attackers to maintain access over extended periods. This vulnerability also poses significant risks to business continuity and customer trust, as compromised web pages can affect entire customer bases and potentially lead to data breaches.
Organizations should immediately implement mitigations including applying the vendor-provided security patches that address the input validation and output encoding issues. Additional protective measures include implementing robust content security policies, deploying web application firewalls, and conducting comprehensive input validation across all user-facing forms. Security teams should also establish monitoring procedures to detect anomalous script injections and regularly audit application code for similar vulnerabilities. The ATT&CK framework categorizes this as a web application attack vector under the technique of code injection, specifically targeting the execution of malicious code in user browsers through persistent data storage mechanisms.