Why the version number of your CMS matters more than it seems, and how to find out what yours is actually running.
Every WordPress release includes security fixes for vulnerabilities discovered since the last one — and once a fix ships, the vulnerability it patches becomes public knowledge, documented specifically so attackers can identify which sites are still running the old, unpatched version. Being a major release behind isn't just "missing new features" — it means every publicly disclosed vulnerability from every version since is a documented, working way in, if the site hasn't updated.
Many WordPress sites unintentionally advertise their version number via the <meta name="generator"> tag in their page source, or via predictable file paths (like readme.html) that ship with the core install. This makes it trivial for anyone — a security scanner or an attacker — to check a site's version without logging in or probing anything.
WordPress.org publishes its own current-version API, the same one your WordPress dashboard uses to tell you "update available." Comparing a detected version against that tells you whether a site is current, or specifically how many major releases behind it is — meaningfully different from "some version is running," since a recent version with the latest security patches is a very different risk than one from several releases ago.
WordPress has an unusually good public source for "what's the current version" — most other CMS platforms and custom-built sites don't. A version being disclosed on a non-WordPress site is still worth knowing (it tells an attacker what to look for), but judging whether that specific version is actually behind requires knowing that platform's own release history, which isn't available in one place the way WordPress's is.
WordPress runs a huge share of small-business websites, and updates are usually one click in the dashboard — the barrier is almost never technical difficulty, it's simply not knowing an update is overdue, or being nervous a plugin will break if you update. Knowing where you actually stand is the first step either way.
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