Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript JavaScript Loops, Arrays and Objects Tracking Multiple Items with Arrays Build a Quiz Challenge, Part 2

Jake Ford
Jake Ford
9,230 Points

Isn't using innerHTML() a security issue?

I have heard that using the innerHTML() function can make a script vulnerable to XSS attacks(Cross Site Scripting). Has anyone else heard this before? Are there alternatives to innerHTML? Maybe using textContent() as discussed here:

http://stackoverflow.com/questions/16860287/security-comparison-of-eval-and-innerhtml-for-clientside-javascript

1 Answer

Steven Parker
Steven Parker
221,451 Points

:point_right: It's only a security issue it it inserts user-provided values.

If you use it to insert static data or something generated without including any inputs from the user, it's not a security concern.

Anytime you put user data on a page it must be encoded or "sanitized". There are a variety of htmlEncode functions available for doing this.

Jake Ford
Jake Ford
9,230 Points

Thanks Steven! I'll check out those htmlEncode functions.