Using inline styles can cause Content Security Policy (CSP) violations in applications

I have been diligently working on an application for quite some time using create-react-app. Recently, I decided to update to the latest version of React only to find out that a new Content Security Policy (CSP) has been implemented.

To my dismay, upon trying to load any page in my app, I am bombarded with 30-40 violations flagged by Chrome devtools. The culprit code is clearly highlighted - here's an example: https://i.sstatic.net/uBp8D.png

The piece of code causing trouble can be found in User.js and is defined in User.css. It baffles me why it is rendering in such a way, ultimately leading to a breakage in my CSP.

Just to provide some context, here is what my csp.json configuration looks like:

{
  "dev": {
    "default-src": ["'self'", "https://*.googleapis.com"],
    "style-src": ["'self'", "https://*.googleapis.com"]
  },
  "prod": {
    "default-src": ["'self'", "https://*.googleapis.com"],
    "style-src": ["'self'", "https://*.googleapis.com"],
    "connect-src": ["'self'", "https://*.googleapis.com"]
  }
}

In Chrome, the source of the issue appears to stem from injectStylesIntoStyleTag.js.

This mishap has completely disrupted the functionality of my app, leaving me desperate for any helpful suggestions.

Your feedback would be greatly appreciated!

javascripthtmlcssreactjscontent-security-policy

Answer №1

Here are some recommendations:

  1. Modify injectStylesIntoStyleTag.js to use external .css files instead of inline styles.
  2. If only a few styles need to be added, hash them all and include in style-src.
  3. Implement a changing nonce in style-src that corresponds to the styles in injectStylesIntoStyleTag.js
  4. Consider allowing 'unsafe-inline' in style-src, especially if your other CSP sources are strict, for more information check out this article.

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