CVE-2023-51763 in ActiveAdmin
Summary
by MITRE • 12/24/2023
csv_builder.rb in ActiveAdmin (aka Active Admin) before 3.2.0 allows CSV injection.
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Analysis
by VulDB Data Team • 02/25/2026
The vulnerability identified as CVE-2023-51763 affects ActiveAdmin, a popular Ruby on Rails administration framework that provides a flexible interface for managing application data through CSV exports. This issue resides within the csv_builder.rb component which handles the generation of CSV files for data export functionality. The vulnerability represents a significant security risk as it allows attackers to inject malicious code into exported CSV files, potentially leading to arbitrary code execution when these files are opened in spreadsheet applications like Microsoft Excel or Google Sheets.
The technical flaw stems from insufficient input validation and sanitization within the CSV export functionality. When ActiveAdmin processes user input for CSV generation, it fails to properly escape or sanitize special characters that have significance in spreadsheet applications. Specifically, the vulnerability occurs when user-provided data contains leading characters such as equals sign, plus, minus, or tab characters that are interpreted by spreadsheet applications as formulas or commands. This creates a classic CSV injection vector where malicious data can be crafted to execute arbitrary commands when the CSV file is opened, as these applications interpret the content as spreadsheet formulas rather than plain text data.
From an operational impact perspective, this vulnerability poses severe risks to organizations using ActiveAdmin for data management and reporting. Attackers can exploit this weakness by crafting malicious input that, when exported to CSV format, executes harmful commands upon file opening. The attack typically involves creating CSV content that begins with formula characters, which when opened in spreadsheet applications can trigger command execution, data exfiltration, or system compromise. This vulnerability affects any application using ActiveAdmin versions prior to 3.2.0, making it particularly dangerous as it can be exploited through legitimate export functionality without requiring special privileges or complex attack vectors.
The vulnerability aligns with CWE-15 (Improper Neutralization of Special Elements used in a Command) and CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component) classifications, reflecting the fundamental issue of inadequate input sanitization in command contexts. It also maps to ATT&CK technique T1059.001 (Command and Scripting Interpreter: PowerShell) and T1059.007 (Command and Scripting Interpreter: JavaScript) as attackers can leverage the CSV injection to execute various command interpreters through spreadsheet applications. Organizations should immediately update to ActiveAdmin version 3.2.0 or later where this vulnerability has been addressed through proper input sanitization and escaping of special characters in CSV generation. Additional mitigations include implementing strict input validation for export functionality, using alternative data export formats, and educating users about the risks of opening untrusted CSV files in spreadsheet applications.