Core: CMS versions checked every 24 hours
The Core platform shows per website which CMS and version it runs, and whether that version is safe.
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No plugin necessary
Core finds WordPress installations itself, from the files on the server, so you don't need to install a plugin.
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Checked against WordPress.org
An older version is not automatically unsafe. Core takes the status that WordPress.org publishes per release.
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A notification for an unsafe version
When a site becomes unsafe, you get a notification by email, in the platform or in Slack.