What steps can be taken to safeguard the integrity of document.referrer against alterations by third-party scripts

My website is currently using a third-party script called Chaordic loader.js for product recommendations, but I am facing an issue where it overrides the document.referrer with inaccurate information, causing me quite a headache.

Query: Is there a way to prevent this interference? Can I somehow lock or protect the document.referrer from being modified?

While one option could be to terminate the contract with the company providing the script, I want to explore other solutions first. I have the ability to include JavaScript code before or after the third-party code, but I am unable to directly modify it.

The following snippet represents the third-party code that alters document.referrer:

var t = window.chaordic && window.chaordic.readCookie && window.chaordic.readCookie(e);
Object.defineProperty(window.document, "referrer", {
  configurable: false,
  get: function() { return t }
});
javascriptreferrer

Answer №1

It's interesting how the answer is intertwined with your question.

// The key is to insert this code before executing their code
const referrer = document.referrer;
Object.defineProperty(window.document, "referrer", {
  configurable: false,
  get: () => referrer,
});

Alternatively, you can achieve it like so:

Object.defineProperty(window.document, "referrer", {
  configurable: false,
  writable: false,
  value: document.referrer
});

Besides Javascript, exploring other possibilities might be wise. Altering the document.referrer is just one questionable action they're taking that you know of. There could be more malicious actions happening under the surface.

Answer №2

If you have control over the document leading to the page affecting document.referrer, ensure that all links are equipped with the attribute rel="noreferrer". This attribute instructs the current window not to track itself as it moves to the next window, causing document.referrer to return null.

Since I am unsure if you can modify the calling page or how you are reaching the target page, I did not flag your question as a duplicate. More details can be found here.

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