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Question 59/115
A developer has a Apex controller for a Visualforce page that takes an ID as a URL parameter. How should the developer prevent a cross site scripting vulnerability?
Correct Answer: C
- Question List (115q)
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Recent Comments (The most recent comments are at the top.)
Correct answer is C!
To prevent cross-site scripting (XSS) attacks in an Apex controller for a Visualforce site that takes an ID as a URL parameter, the developer should use a method that protects the input from potential XSS attacks.
The best option is:
C. ApexPages.currentPage().getParameters().get('url_param').escapeHtml4()
Justification:
The escapeHtml4() method ensures that special characters in the URL parameter (such as '<', '>', '&') are properly encoded, preventing them from being interpreted as HTML or JavaScript code. This is the safest way to protect your input from XSS attacks.
Other options:
A. String.ValueOf(ApexPages.currentPage().getParameters().get('url_param')): This option simply converts the parameter to a string, but does not protect against XSS.
B. String.escapeSingleQuotes(ApexPages.currentPage().getParameters().get('url_param')): The escapeSingleQuotes method only protects against SQL injections by escaping single quotes, but does not protect against XSS.
D. ApexPages.currentPage().getParameters().get('url_param'): This option offers no protection against XSS and simply retrieves the value of the URL parameter....
Correct answer is B