The other aspect of security is to make sure the contents of your notebooks are not malicious. You should make sure your notebook is safe, as follows:

• Ensure that HTML is sanitized (looking for malicious HTML coding and subverting it)
• Do not allow your notebook to execute external JavaScript
• Check cell contents that may be malicious are challenged in a server environment
• Sanitize output of cells so as not to produce unwanted effects on user machines