Ticket #56532: 56532-37.diff

src/wp-admin/css/colors-classic.css

@@ -734 +734 @@
         color: #555;
 }
 
+.update-nag-core-insecure {
+        color: #fff;
+        background-color: #ac1b1b;
+        border-color: #cd5a5a;
+}
+
+.update-nag-core-insecure a {
+        color: #fff;
+}
+
 #screen-meta {
         background-color: #eff8ff;
         border-color: #d1e5ee;

src/wp-admin/css/colors-fresh.css

@@ -732 +732 @@
         color: #555;
 }
 
+.update-nag-core-insecure {
+        color: #fff;
+        background-color: #ac1b1b;
+        border-color: #cd5a5a;
+}
+
+.update-nag-core-insecure a {
+        color: #fff;
+}
+
 #screen-meta {
         background-color: #f1f1f1;
         border-color: #ccc;

src/wp-admin/css/wp-admin.css

@@ -1123 +1123 @@
         border-bottom-left-radius: 3px;
 }
 
+.update-nag-core-insecure {
+        color: #fff;
+        background-color: #ac1b1b;
+        border-color: #cd5a5a;
+        font-weight: bold;
+}
+
+.update-nag-core-insecure > p {
+        margin-left: 1em;
+        margin-right: 1em;
+}
+
+.update-nag-core-insecure > p:first-child {
+        margin-top: 0;
+        clear: right; /* Screen options, help tabs */
+}
+
+.update-nag-core-insecure > p:last-child {
+        margin-bottom: 0;
+}
+
+.update-nag-core-insecure a {
+        color: #fff;
+}
+
 .plugins .plugin-update {
         padding: 0;
 }

src/wp-admin/includes/update.php

@@ -210 +210 @@
                 return false;
 
         if ( current_user_can('update_core') ) {
-                $msg = sprintf( __('<a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> is available! <a href="%2$s">Please update now</a>.'), $cur->current, network_admin_url( 'update-core.php' ) );
+                $msg       = sprintf( __('<a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> is available! <a href="%2$s">Please update now</a>.'), $cur->current, network_admin_url( 'update-core.php' ) );
+                $msg_line2 = sprintf(
+                        /* translators: 1: WordPress version number, 2: Link to update WordPress */
+                        __( 'Important! Your version of WordPress (%1$s) is no longer supported, you will not receive any security updates for your website. To keep your site secure, please <a href="%2$s">update to the latest version of WordPress</a>.' ),
+                        get_bloginfo( 'version', 'display' ),
+                        network_admin_url( 'update-core.php' )
+                );
         } else {
-                $msg = sprintf( __('<a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> is available! Please notify the site administrator.'), $cur->current );
+                $msg       = sprintf( __('<a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> is available! Please notify the site administrator.'), $cur->current );
+                $msg_line2 = sprintf(
+                        /* translators: 1: WordPress version number, 2: Link to update WordPress */
+                        __( 'Important! Your version of WordPress (%1$s) is no longer supported, you will not receive any security updates for your website. To keep your site secure, please <a href="%2$s">update to the latest version of WordPress</a>.' ),
+                        get_bloginfo( 'version', 'display' ),
+                        'https://wordpress.org/download/'
+                );
         }
-        echo "<div class='update-nag'>$msg</div>";
+        echo "<div class='update-nag update-nag-core-insecure'><p>$msg</p><p>$msg_line2</p></div>";
 }
 add_action( 'admin_notices', 'update_nag', 3 );
 add_action( 'network_admin_notices', 'update_nag', 3 );