{"id":3339,"date":"2026-06-19T10:15:00","date_gmt":"2026-06-19T10:15:00","guid":{"rendered":"https:\/\/getdarkscout.com\/blog\/?p=3339"},"modified":"2026-06-19T07:21:20","modified_gmt":"2026-06-19T07:21:20","slug":"what-is-mixed-content-and-how-do-you-fix-it","status":"publish","type":"post","link":"https:\/\/getdarkscout.com\/blog\/what-is-mixed-content-and-how-do-you-fix-it\/","title":{"rendered":"What Is Mixed Content and How Do You Fix It?"},"content":{"rendered":"\n

You’ve installed your SSL certificate. Your site loads over HTTPS. The padlock should be there.<\/p>\n\n\n\n

Instead, you see a broken padlock, a “Not fully secure” warning, or worse, a full browser block with certain resources simply refusing to load.<\/p>\n\n\n\n

That’s mixed content. And it’s one of the most common website security issues that appears specifically after you’ve done the right thing and moved your site to HTTPS.<\/p>\n\n\n\n

The good news is that mixed content is fixable. The frustrating part is finding every instance of it, especially on larger sites where HTTP resources can be buried in stylesheets, third-party scripts, and database-stored URLs you’ve forgotten about.<\/p>\n\n\n\n

This guide explains exactly what mixed content is, why it’s a security risk, how browsers handle it, how to find every instance on your site, and how to fix it permanently, regardless of what platform you’re running.<\/p>\n\n\n\n

<\/span>What Is Mixed Content?<\/span><\/h2>\n\n\n\n

Mixed content is when a secure webpage serves content over an insecure protocol (HTTP).<\/p>\n\n\n\n

If someone accesses your site through HTTPS, their browser will encrypt the connection to your Web server. All data sent between them and your website is secure from being hacked. If your HTTPS page accesses a resource from an HTTP URL, however, such as an image, stylesheet, script, etc., then that resource will be transmitted over an unencrypted connection.<\/p>\n\n\n\n

The result is a page that’s partly secure and partly not. The browser can’t display the full padlock icon because the security guarantee it represents doesn’t apply to everything on the page.<\/p>\n\n\n\n

Here’s what mixed content looks like in a URL context. A page loaded at https:\/\/yoursite.com<\/code> contains the following in its HTML:<\/p>\n\n\n\n

html<\/p>\n\n\n\n

<img src=\"http:\/\/yoursite.com\/images\/logo.png\">\n<script src=\"http:\/\/analytics.example.com\/track.js\"><\/script>\n<link rel=\"stylesheet\" href=\"http:\/\/fonts.example.com\/font.css\"><\/code><\/pre>\n\n\n\n
All three of those resources are being requested over HTTP. The page itself is HTTPS. That combination is mixed content.<\/p>\n\n\n\n
The most common time this appears is immediately after migrating a site from HTTP to HTTPS. The SSL certificate gets installed. The site URL is updated. But hundreds of hardcoded HTTP references in the content, database, and templates remain pointing to the old unencrypted versions.<\/p>\n\n\n\n
<\/span>Why Mixed Content Is a Real Security Risk<\/span><\/h2>\n\n\n\n
Most explanations of mixed content say it “creates vulnerabilities.” That’s accurate but vague. Here’s the concrete risk.<\/p>\n\n\n\n
When your HTTPS page loads a resource over HTTP, that HTTP request is unencrypted. Anyone positioned between the user’s device and your server can see that request, and can modify what gets returned.<\/p>\n\n\n\n
This is called an on-path attack, sometimes referred to as a man-in-the-middle attack. On public Wi-Fi, a hotel network, or any environment where an attacker can intercept unencrypted traffic, they can replace the HTTP resource your page is requesting with a malicious version.<\/p>\n\n\n\n
Consider what that means for a JavaScript file loaded over HTTP. You have an HTTPS page where you instructed the browser to load a script from \u201chttp:\/\/yoursite.com\/app.js\u201d. An attacker captures that HTTP request to \u201chttp:\/\/yoursite.com\/app.js\u201d and serves back a malicious version of the JavaScript file. That code runs in the context of your HTTPS page, with access to your cookies, your session tokens, and anything else the page has access to. The user’s browser trusted the script because it came from your page. The connection the user thought was encrypted allowed the attack.<\/p>\n\n\n\n
This is why the browser security model treats mixed content as a serious problem, not just a cosmetic one. An HTTPS page is only as secure as every resource it loads. A single HTTP resource is a potential injection point.<\/p>\n\n\n\n
For a broader look at how this fits into the landscape of issues that can compromise a website, common website vulnerabilities<\/a> cover the full range of weaknesses that attackers actively look for.<\/p>\n\n\n\n
<\/span>Active vs Passive Mixed Content: Why the Distinction Matters<\/span><\/h2>\n\n\n\n
Browsers treat different types of mixed content differently based on the level of risk they create. Understanding this distinction explains why some HTTP resources cause a warning while others cause a full block.<\/p>\n\n\n\n
Active mixed content<\/strong> refers to resources that can execute code or directly affect the behavior of the page: JavaScript files, CSS stylesheets, iframes, XHR requests, and fetch API calls.<\/p>\n\n\n\n
Active mixed content is the high-risk category. A malicious actor who intercepts and replaces an HTTP JavaScript file gets full code execution in the page context. This is severe enough that modern browsers block active mixed content entirely. The resource simply won’t load, and the browser records a console error rather than a warning.<\/p>\n\n\n\n
Passive mixed content<\/strong> refers to resources that affect visual presentation but can’t execute code in the same way: images, audio files, and video files.<\/p>\n\n\n\n
Passive mixed content historically generated a warning rather than a block. Browsers would load the resource but flag the page as “not fully secure.” Current browsers in 2026 are aggressively auto upgrading all passive mixed content to try to load HTTPS-equivalent images\/audio\/video. If the HTTPS version of the resource exists, the browser uses it silently. If it doesn’t exist, the resource gets blocked rather than loaded over HTTP.<\/p>\n\n\n\n
The practical result: in modern browsers, mixed content is increasingly treated as a block rather than a warning across all resource types, not just scripts and stylesheets. The era of “passive mixed content generates a yellow warning” is being replaced by a model where most mixed content either gets silently upgraded or blocked entirely.<\/p>\n\n\n\n
<\/span>How Browsers Handle Mixed Content in 2026<\/span><\/h2>\n\n\n\n
If you know what each of the major browsers will do for your specific mix-content issue, you will be able to understand what each sees and, therefore, which items you need to address first.<\/p>\n\n\n\n