CVE-2020-9466 in Export Users to CSV Plugin
Summary
by MITRE
The Export Users to CSV plugin through 1.4.2 for WordPress allows CSV Injection.
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Analysis
by VulDB Data Team • 05/11/2025
The CVE-2020-9466 vulnerability affects the Export Users to CSV plugin version 1.4.2 and earlier in the WordPress ecosystem, representing a critical security flaw that enables CSV injection attacks. This vulnerability specifically targets the plugin's handling of user data export functionality, where user information is serialized into comma-separated values format for external processing. The flaw stems from insufficient input validation and sanitization within the plugin's export mechanism, allowing malicious actors to inject dangerous formulas or commands into CSV cells that could be interpreted by spreadsheet applications like Microsoft Excel or Google Sheets.
The technical implementation of this vulnerability occurs when user data containing special characters such as equals signs, plus signs, minus signs, or tab characters is exported to CSV format without proper escaping or sanitization. When spreadsheet applications process these malformed CSV files, they may interpret the injected content as executable formulas rather than plain text data, leading to potential code execution or data manipulation scenarios. This type of injection vulnerability is classified under CWE-1236, which specifically addresses the improper handling of input data that can result in command injection or formula execution in spreadsheet applications.
From an operational perspective, this vulnerability presents significant risks to WordPress administrators and their users, particularly in environments where exported user data is processed by multiple stakeholders or integrated into automated workflows. The impact extends beyond simple data exposure, as successful exploitation could enable attackers to execute malicious commands on systems where the CSV files are opened, potentially leading to full system compromise or data exfiltration. The vulnerability is particularly dangerous in enterprise environments where user data exports are routine operations and where spreadsheet applications are commonly used for data analysis and reporting.
Organizations should immediately update to the latest version of the Export Users to CSV plugin or implement alternative user export mechanisms that properly sanitize data before CSV generation. Security measures should include implementing proper input validation at the plugin level, ensuring that all user data is escaped or encoded when exported to CSV format, and educating users about the risks of opening untrusted CSV files in spreadsheet applications. Additionally, network segmentation and access controls should be reviewed to limit potential exploitation paths, and security monitoring should be enhanced to detect unusual export activities or attempts to manipulate user data through this vulnerability. The ATT&CK framework categorizes this as a technique involving command and control through spreadsheet manipulation, while the broader security community recognizes it as a critical component of the attack chain that can enable lateral movement and privilege escalation within compromised systems.