CVE-2021-36041 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 an improper input validation vulnerability. An attacker with admin privileges could upload a specially crafted file in the 'pub/media` directory could lead to remote code execution.
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Analysis
by VulDB Data Team • 11/08/2025
This vulnerability exists within Magento Commerce platforms where improper input validation allows for arbitrary file uploads in the pub/media directory. The flaw stems from insufficient sanitization of file names and content during the upload process, creating a pathway for malicious actors to execute code remotely. 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 particularly concerning given the widespread adoption of these platform versions. The security issue is classified as a weakness in input validation, which aligns with CWE-20, a well-known weakness category that encompasses improper validation of input data. This vulnerability represents a critical risk because it requires only administrative access to exploit, meaning that an attacker who has already gained administrative privileges can leverage this flaw to escalate their capabilities.
The technical exploitation of this vulnerability involves an attacker with admin credentials uploading a malicious file to the pub/media directory, which serves as a publicly accessible media storage location. This directory is designed for storing user-generated content such as product images, but the lack of proper validation allows for executable file types to be uploaded and subsequently executed. The attack vector operates through the web application's file handling mechanisms, where the system fails to properly validate the file type, content, or naming conventions. This weakness enables attackers to bypass normal security controls that would typically prevent the upload of potentially harmful files. The vulnerability creates a persistent backdoor within the system, allowing attackers to execute arbitrary commands on the server and potentially gain further access to the underlying infrastructure.
The operational impact of this vulnerability extends far beyond simple file upload capabilities. Once exploited, attackers can establish persistent access to the Magento system and potentially use it as a foothold for broader network infiltration. The remote code execution capability means that an attacker can deploy malware, steal sensitive data, modify system configurations, or use the compromised system as a launch point for attacks on other network components. This vulnerability directly aligns with ATT&CK technique T1059 which covers execution through command and script interpreters, and T1078 which covers valid accounts for lateral movement. The impact is particularly severe because the vulnerability affects the core application functionality and can lead to complete system compromise. Organizations using affected versions face significant risk of data breaches, service disruption, and potential regulatory compliance violations.
Organizations should immediately upgrade to patched versions of Magento Commerce to remediate this vulnerability. The recommended mitigation strategy includes implementing strict file type validation, restricting write permissions on the pub/media directory, and implementing proper access controls to prevent unauthorized administrative access. Additional security measures should include regular security audits, monitoring for suspicious file uploads, and implementing web application firewalls to detect and block malicious file upload attempts. The vulnerability demonstrates the critical importance of input validation and proper file handling within web applications, reinforcing the need for comprehensive security testing and continuous monitoring. Security teams should also consider implementing principle of least privilege access controls and regular security training to prevent administrative credential compromise, as the vulnerability requires administrative access to exploit.