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Sanitization missing for register_setting().

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All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$cn_nf_exclude_domains'.

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Functions declared in the global namespace by a theme/plugin should start with the theme/plugin prefix. Found: "register_cn_nf_settings".

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All output should be run through an escaping function (like esc_html_e() or esc_attr_e()), found '_e'.

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Detected usage of a non-sanitized input variable: $_SERVER['HTTP_HOST']

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Detected usage of a possibly undefined superglobal array index: $_SERVER['HTTP_HOST']. Check that the array index exists before using it.

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$_SERVER['HTTP_HOST'] not unslashed before sanitization. Use wp_unslash() or similar

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Missing $domain parameter in function call to _e().

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PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

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Tested up to: 6.5 < 7.0. The "Tested up to" value in your plugin is not set to the current version of WordPress. This means your plugin will not show up in searches, as we require plugins to be compatible and documented as tested up to the most recent version of WordPress.