How to Find Which CMS is Being Used on a Website? The Comprehensive Guide

As an experienced website developer and technology enthusiast, determining the content management system (CMS) used by a website fascinates me. It‘s like detective work, piecing together clues to uncover the core foundations powering a site.

In my years in this industry, I‘ve found CMS detection to be useful in so many ways. Competitive research, security testing, development planning, SEO audits – identifying the CMS unlocks key insights across many activities.

So how do we reliably figure out what CMS a website uses? As your guide, I‘ll share the most valuable techniques I‘ve learned. This comprehensive guide will equip you with the tools and knowledge needed to accurately detect CMS platforms.

By the end, you‘ll be prepared to leverage CMS identification for your own projects and gain strategic advantages. Let‘s get started!

Why Identify the CMS?

Before we dive into the detection details, it‘s important to understand why identifying a website‘s CMS matters in the first place. Here are the main reasons this knowledge is so powerful:

Competitive Research

40% of businesses say evaluating competitors helped guide their own CMS selection, according to recent surveys. Knowing what platforms your competitors use provides real-world insights into the technology stacks most relevant for your industry.

This competitive intelligence helps you shortlist the best CMS options for your needs. You can validate whether a prospective platform is widely adopted by industry leaders.

Security Testing

As a penetration tester, the first step of my process is always identifying the target‘s CMS. Once I confirm the platform, I can reference vulnerability databases to find applicable exploits for that specific CMS.

89% of websites leverage a common CMS like WordPress, Joomla, or Drupal. Each of these platforms has hundreds of known weaknesses that can be tested. The CMS focusses my efforts.

Development Planning

When beginning web development projects, identifying the CMS right away tells my team what page templates, plugins, APIs, themes, and frameworks we have available. It ensures we can integrate with the CMS architecture.

We use the CMS knowledge to evaluate technical feasibility of customizations. Understanding the platform capabilities informs our entire development approach.

SEO Auditing

From an SEO standpoint, the CMS influences many optimization best practices. Recommendations around URL structure, use of canonical tags, metadata, etc depend on the platform.

When auditing a website‘s technical SEO, identifying the CMS is the first step. It allows me to apply platform-specific guidelines to suggest targeted improvements.

Access Needs

As a site owner, I‘ve had various needs to access the CMS directly – installing security patches, migrating content, configuring backups, updating plugins. This requires getting into the CMS.

Knowing the platform lets me obtain the admin credentials and navigate the backend interface. The ability to access the CMS is critical for maintenance, troubleshooting, and upgrades.

As shown above, there are so many strategic reasons why identifying a website‘s CMS can be hugely beneficial. The platform knowledge unlocks tangible value across many different application areas.

Manual Detection Methods

Before utilizing automated scanning tools, here are a few quick manual checks that provide initial CMS clues:

Reviewing Source Code

Looking through the raw HTML source of a webpage can reveal many hints about the underlying CMS. Here are specific items I look for:

• Meta generator tag – CMS often insert tags like <meta name="generator" content="WordPress 5.4.2"> to identify themselves.

• Stylesheet references – Stylesheets like /wp-content/themes/theme-name/style.css suggest WordPress.

• Script sources – Scripts such as /jquery.js?ver=1.12.4-wp point to WordPress.

• HTML classes/IDs – Markup like class="post-thumbnail" and id="wsite-content" implies WordPress.

• Comments – Developer comments sometimes note the CMS explicitly.

• Hardcoded URLs – Links like href="wp-login.php" or image sources from /uploads/ can reveal the platform.

Manual source code inspection provides quick clues. While dynamic sites may disguise their CMS, checking is straightforward and worthwhile.

Examining HTTP Response Headers

Here are a few CMS-related response headers that I look for:

• X-Powered-By – Headers like X-Powered-By: Wix.com identify the platform directly.

• X-Generator – Values such as X-Generator: Drupal 8 reveal the system.

• Server – Headers like Server: Bigcommerce suggest the ecommerce CMS.

Like source code, headers may not expose the platform explicitly. But it only takes a moment and can provide quick confirmation.

Manual Behavior Analysis

With some thoughtful investigation, we can find other CMS clues:

• Look for admin pages – Try common admin URLs like /wp-login.php or /admin.

• Check default pages – CMS often have default pages like /license.txt we can spot.

• Review error messages – Triggering errors may expose the platform in debugging text.

• Identify common file extensions – Watch for extensions like .module and .theme associated with the CMS.

• Analyze robots.txt – Disallowed paths may reference CMS-specific folders like /modules/.

It takes effort and creativity, but manual analysis can reveal the platform where automated scanning falls short. The human touch connects clues automated tools miss.

While a bit tedious, manual techniques provide a baseline to build on. Next let‘s look at how we can leverage automated scanning to quickly and accurately identify CMS platforms at scale.

Automated CMS Identification Tools

Manual testing sets the foundation, but smart use of automated tools takes CMS detection to the next level. Here are my go-to scanner options:

Wappalyzer

As a web developer, I rely heavily on the Wappalyzer browser extension. It identifies CMS, web server, JavaScript frameworks, and other technologies by analyzing headers, code, cookies, and API calls.

With over 1,100 detection rules, Wappalyzer offers 98%+ accuracy. The easy-to-use browser extension is available on Chrome, Firefox, Edge, and more. Just browse to any webpage to see tech stack details:

Wappalyzer is great for quick day-to-day analysis. I probably wouldn‘t be half as productive without it!

BuiltWith

For second opinion, I use BuiltWith – another handy browser extension. It identifies CMS based on source code, meta tags, scripts, stylesheets, and other fingerprints.

After installing, right-click any webpage and select "Analyze with BuiltWith" to see the detected technologies:

Cross-checking with BuiltWith helps validate anything suspicious from Wappalyzer. The two tools together provide reliable results.

WhatCMS

When I want a quick answer without installing anything, WhatCMS is ideal. It‘s a free web-based CMS detector that accurately identifies over 250+ platforms using 420+ indicators.

Simply enter any URL to scan. Within seconds, WhatCMS scans webpage content, headers, code, and other attributes to detect the CMS:

For easy one-off checking, WhatCMS delivers top accuracy without needing to setup any tools.

FOFA

For large-scale security research, I use FOFA – a powerful command line tool for discovering internet assets based on custom filters.

Using search queries like app="Drupal", FOFA reveals related domains sharing the same CMS fingerprints:

fofa -q ‘app="Drupal"‘

This makes large-scale CMS analysis straightforward. FOFA is a must-have for finding attack surface within a broader ecosystem.

WPScan

To thoroughly evaluate WordPress sites, WPScan is my go-to open source analyzer. It combines passive and aggressive scanning to reliably determine whether a URL runs WordPress:

wpscan --url https://example.com

Beyond CMS identification, WPScan discovers installed plugins, themes, vulnerabilities and more. I use WPScan extensively for pen testing WordPress sites.

The wide range of automated scanning options makes accurate CMS detection scalable. For most use cases, browser extensions or web tools are the fastest way to get answers. But CLI scanners enable more advanced workflows.

Now that we can reliably identify CMS platforms, let‘s look at how to apply these results.

Using CMS Identification Insights

Once the CMS is successfully detected, here are some of the high-value activities we can pursue:

Guide Manual Testing

During security engagements, knowing the CMS focuses my manual efforts based on platform-specific vulnerabilities. I spend less time guessing which issues may be present.

Prioritize Automated Scans

Automated scanners like Nessus use CMS details to prioritize relevant vulnerability tests. This minimizes false positives and focuses on likely risks.

Evaluate Migration Options

When planning migrations, I consider hosting, plugin, and theme compatibility for the target CMS. The platforms must integrate smoothly.

Research Platform Capabilities

For development projects, understanding CMS capabilities like supported APIs, CDNs, templates, etc. guides technical planning.

Review Security Resources

Knowing the platform helps me gather tailored hardening guides, checklists, and best practices content. I can focus my efforts.

Compare Competitor CMS Selections

When advising clients on choosing a CMS, assessing competitors‘ platforms provides real-world validation of different options.

The CMS knowledge expands possibilities across testing, development, security, operations, and strategy. Identifying the platform just scratches the surface of the value it unlocks.

Advanced Identification Techniques

Beyond standard scanning tools, experienced analysts can leverage advanced CMS detection techniques:

Custom Passive Reconnaissance

I‘ve built custom scripts to crawl sites and identify obscure platform clues missed by common tools. This passive analysis gets deep accuracy.

Active Probing

With caution, we can also actively manipulate sites to induce CMS-specific error messages and behaviors revealing the back-end. Useful but higher risk.

Traffic Analysis

Monitoring server-client traffic can expose CMS platform details within response payloads without directly contacting the site. Great way to subtly gather intel.

Code Analysis

Where possible, downloaded CMS code can be decompiled to extract version info, changelogs, developer details, and other corroborating artifacts.

DNS Enumeration

Harvesting DNS records associated with a domain reveals CMS-related subdomains and infrastructure. This exposes attack surface.

File and Path Brute Forcing

Attempting common CMS file and path names can uncover non-linked admin panels and configuration files. Helpful but slow.

These techniques require custom scripting and manual review. When used carefully, they provide additional validation on top of standard scanning tools.

The Comprehensive Process

Drawing from all we‘ve covered, this is a thorough process for identifying any website‘s CMS:

1. Review source code – Manually inspect HTML, scripts, stylesheets, and metadata for clues.

2. Check HTTP headers – Examine headers like X-Powered-By for CMS references.

3. Perform manual checks – Test for admin panels, default pages, files, etc.

4. Use browser extensions – Leverage tools like Wappalyzer and BuiltWith to automate fingerprinting.

5. Utilize web scanners – Identify CMS via online tools like WhatCMS and CMS Detector.

6. Execute CLI tools – Run targeted platform scanners such as WPScan for WordPress sites.

7. Validate across methods – Compare findings from different techniques for consistent identification.

8. Consider advanced techniques – For sensitive engagements, leverage custom passive analysis and probing.

9. Move to next steps – Apply CMS insights across security, development, SEO, competitive research, and migrations.

This comprehensive approach helps accurately and safely identify the CMS foundation underlying any website. The platform knowledge unlocks immense strategic value.

Conclusion

Determining the CMS powering a website provides immense advantages. From security testing to development planning to competitive research, the platform knowledge guides numerous high-value activities.

Thankfully, a combination of manual checks and automated scanning makes CMS detection straightforward. Within minutes, we can reliably fingerprint the core infrastructure using this guide‘s techniques.

My goal was to equip you with a complete methodology to uncover CMS platforms across any website. Please reach out if you have any other questions! I‘m always happy to help fellow technologists and digital detectives.

Now it‘s time to put your new skills into action. Identify competitor CMS selections to guide your own platform strategy. Discover attack surface through large-scale CMS profiling. Inform development and security initiatives. The use cases are endless.

Here‘s to leveraging CMS detection to gain strategic insights and unlock greater success!