Mailchimp Widget by ProteusThemes

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

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A function call to esc_html__() with texts containing placeholders was found, but was not accompanied by a "translators:" comment on the line above to clarify the meaning of the placeholders.

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

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$_GET['api_key'] not unslashed before sanitization. Use wp_unslash() or similar

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The plugin name includes a restricted term. Your chosen plugin name - "Mailchimp Widget by ProteusThemes" - contains the restricted term "mailchimp" and cannot be used to begin your plugin name. We disallow the use of certain terms in ways that are abused, or potentially infringe on and/or are misleading with regards to trademarks. You may use the term "mailchimp" elsewhere in your plugin name, such as "... for mailchimp".

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Plugin name "Mailchimp Widget by ProteusThemes" is different from the name declared in plugin header "Mailchimp widget by ProteusThemes".

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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: 5.4 < 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.

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One or more tags were ignored. The following tags are not permitted: "plugin", "wordpress"

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One or more tags were ignored. Please limit your plugin to 5 tags.