Filetype Xls Username Password Email
| A (Column) | B (Column) | C (Column) | D (Column) | … |
|------------|------------|------------|------------|---|
| UserID | Username | Email | Password (hashed) | Optional fields (e.g., role, status) |
| 001 | jdoe | jdoe@example.com | e3afed0047b08059d0fada10f400c1e5 | Admin |
| 002 | asmith | asmith@example.org | 5f4dcc3b5aa765d61d8327deb882cf99 | User |
| … | … | … | … | … |
Best‑practice tip: Store hashed passwords (e.g., SHA‑256, bcrypt) rather than plaintext. Include a separate column for the salt if you’re using a salted hash. filetype xls username password email
Security researchers have found spreadsheets via this query containing: | A (Column) | B (Column) | C
In one famous 2019 incident, a Fortune 500 company left an Excel file named all_admins_passwords.xls on a public marketing subdomain. The file contained 1,200 rows of domain administrator credentials. It was found using nothing more than filetype:xls "password" "admin". Security researchers have found spreadsheets via this query
Most programming languages have libraries that can read/write .xls files:
| Language | Library | Example Code Snippet |
|----------|---------|----------------------|
| Python | xlrd / xlwt (read) and openpyxl (write) | python<br>import xlrd<br>wb = xlrd.open_workbook('UserCredentials.xls')<br>sheet = wb.sheet_by_index(0)<br>for row_idx in range(1, sheet.nrows):<br> username = sheet.cell(row_idx, 1).value<br> email = sheet.cell(row_idx, 2).value<br> password_hash = sheet.cell(row_idx, 3).value<br> # process record … |
| Java | Apache POI | java<br>Workbook wb = WorkbookFactory.create(new FileInputStream("UserCredentials.xls"));<br>Sheet sheet = wb.getSheetAt(0);<br>for (Row r : sheet) <br> if (r.getRowNum() == 0) continue; // skip header<br> String username = r.getCell(1).getStringCellValue();<br> // …<br> |
| C# | EPPlus (for .xlsx) or NPOI (for .xls) | csharp<br>using (var stream = File.OpenRead("UserCredentials.xls"))<br><br> var workbook = new HSSFWorkbook(stream);<br> var sheet = workbook.GetSheetAt(0);<br> // iterate rows …<br> |
Security note: When you read password hashes from the file, never log or display them. Treat them as you would any other secret.