This test checks whether the full WordPress version appears in public page meta, usually the generator tag in the HTML head. That makes it easier for attackers to target known issues for that exact release.
To confirm, view your site’s HTML source and look for a generator meta tag that includes a version number.
You can remove that output with a security plugin fix or a small theme/plugin snippet. On Pro, see Hide WP Version.
Hiding the version is useful hardening. It is not a substitute for updating WordPress, themes, and plugins.
