Grouped backports to the 5.6 branch.

- Editor: Bump @wordpress packages for the branch,
- Media: Refactor search by filename within the admin,
- REST API: Lockdown post parameter of the terms endpoint,
- Customize: Escape blogname option in underscores templates,
- Query: Validate relation in `WP_Date_Query`,
- Posts, Post types: Apply KSES to post-by-email content,
- General: Validate host on "Are you sure?" screen,
- Posts, Post types: Remove emails from post-by-email logs,
- Pings/trackbacks: Apply KSES to all trackbacks,
- Mail: Reset PHPMailer properties between use,
- Comments: Apply kses when editing comments,
- Widgets: Escape RSS error messages for display.

Merges [54521-54530] to the 5.6 branch.
Props audrasjb, costdev, cu121, dd32, davidbaumwald, ehtis, johnbillion, johnjamesjacoby, martinkrcho, matveb, oztaser, paulkevan, peterwilsoncc, ravipatel, SergeyBiryukov, talldanwp, timothyblynjacobs, tykoted, voldemortensen, vortfu, xknown.

Built from https://develop.svn.wordpress.org/branches/5.6@54555


git-svn-id: http://core.svn.wordpress.org/branches/5.6@54110 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/ajax-actions.php

@@ -2975,7 +2975,7 @@ function wp_ajax_query_attachments() {
 
 	// Filter query clauses to include filenames.
 	if ( isset( $query['s'] ) ) {
-		add_filter( 'posts_clauses', '_filter_query_attachment_filenames' );
+		add_filter( 'wp_allow_query_attachment_by_filename', '__return_true' );
 	}
 
 	/**

wp-admin/includes/post.php

@@ -1269,7 +1269,7 @@ function wp_edit_attachments_query_vars( $q = false ) {
 
 	// Filter query clauses to include filenames.
 	if ( isset( $q['s'] ) ) {
-		add_filter( 'posts_clauses', '_filter_query_attachment_filenames' );
+		add_filter( 'wp_allow_query_attachment_by_filename', '__return_true' );
 	}
 
 	return $q;

wp-includes/class-wp-date-query.php

@@ -149,8 +149,8 @@ class WP_Date_Query {
 			return;
 		}
 
-		if ( isset( $date_query['relation'] ) && 'OR' === strtoupper( $date_query['relation'] ) ) {
-			$this->relation = 'OR';
+		if ( isset( $date_query['relation'] ) ) {
+			$this->relation = $this->sanitize_relation( $date_query['relation'] );
 		} else {
 			$this->relation = 'AND';
 		}
@@ -219,6 +219,9 @@ class WP_Date_Query {
 			$this->validate_date_values( $queries );
 		}
 
+		// Sanitize the relation parameter.
+		$queries['relation'] = $this->sanitize_relation( $queries['relation'] );
+
 		foreach ( $queries as $key => $q ) {
 			if ( ! is_array( $q ) || in_array( $key, $this->time_keys, true ) ) {
 				// This is a first-order query. Trust the values and sanitize when building SQL.
@@ -1039,4 +1042,20 @@ class WP_Date_Query {
 
 		return $wpdb->prepare( "DATE_FORMAT( $column, %s ) $compare %f", $format, $time );
 	}
+
+	/**
+	 * Sanitizes a 'relation' operator.
+	 *
+	 * @since 6.0.3
+	 *
+	 * @param string $relation Raw relation key from the query argument.
+	 * @return string Sanitized relation ('AND' or 'OR').
+	 */
+	public function sanitize_relation( $relation ) {
+		if ( 'OR' === strtoupper( $relation ) ) {
+			return 'OR';
+		} else {
+			return 'AND';
+		}
+	}
 }

wp-includes/class-wp-query.php

@@ -441,6 +441,13 @@ class WP_Query {
 	 */
 	public $thumbnails_cached = false;
 
+	/**
+	 * Controls whether an attachment query should include filenames or not.
+	 *
+	 * @since 6.0.3
+	 * @var bool
+	 */
+	protected $allow_query_attachment_by_filename = false;
 	/**
 	 * Cached list of search stopwords.
 	 *
@@ -1391,7 +1398,12 @@ class WP_Query {
 			}
 
 			$like      = $n . $wpdb->esc_like( $term ) . $n;
-			$search   .= $wpdb->prepare( "{$searchand}(({$wpdb->posts}.post_title $like_op %s) $andor_op ({$wpdb->posts}.post_excerpt $like_op %s) $andor_op ({$wpdb->posts}.post_content $like_op %s))", $like, $like, $like );
+
+			if ( ! empty( $this->allow_query_attachment_by_filename ) ) {
+				$search .= $wpdb->prepare( "{$searchand}(({$wpdb->posts}.post_title $like_op %s) $andor_op ({$wpdb->posts}.post_excerpt $like_op %s) $andor_op ({$wpdb->posts}.post_content $like_op %s) $andor_op (sq1.meta_value $like_op %s))", $like, $like, $like, $like );
+			} else {
+				$search .= $wpdb->prepare( "{$searchand}(({$wpdb->posts}.post_title $like_op %s) $andor_op ({$wpdb->posts}.post_excerpt $like_op %s) $andor_op ({$wpdb->posts}.post_content $like_op %s))", $like, $like, $like );
+			}
 			$searchand = ' AND ';
 		}
 
@@ -1784,6 +1796,16 @@ class WP_Query {
 		// Fill again in case 'pre_get_posts' unset some vars.
 		$q = $this->fill_query_vars( $q );
 
+		/**
+		 * Filters whether an attachment query should include filenames or not.
+		 *
+		 * @since 6.0.3
+		 *
+		 * @param bool $allow_query_attachment_by_filename Whether or not to include filenames.
+		 */
+		$this->allow_query_attachment_by_filename = apply_filters( 'wp_allow_query_attachment_by_filename', false );
+		remove_all_filters( 'wp_allow_query_attachment_by_filename' );
+
 		// Parse meta query.
 		$this->meta_query = new WP_Meta_Query();
 		$this->meta_query->parse_query_vars( $q );
@@ -2215,7 +2237,7 @@ class WP_Query {
 			}
 		}
 
-		if ( ! empty( $this->tax_query->queries ) || ! empty( $this->meta_query->queries ) ) {
+		if ( ! empty( $this->tax_query->queries ) || ! empty( $this->meta_query->queries ) || ! empty( $this->allow_query_attachment_by_filename ) ) {
 			$groupby = "{$wpdb->posts}.ID";
 		}
 
@@ -2292,6 +2314,10 @@ class WP_Query {
 		}
 		$where .= $search . $whichauthor . $whichmimetype;
 
+		if ( ! empty( $this->allow_query_attachment_by_filename ) ) {
+			$join .= " LEFT JOIN {$wpdb->postmeta} AS sq1 ON ( {$wpdb->posts}.ID = sq1.post_id AND sq1.meta_key = '_wp_attached_file' )";
+		}
+
 		if ( ! empty( $this->meta_query->queries ) ) {
 			$clauses = $this->meta_query->get_sql( 'post', $wpdb->posts, 'ID', $this );
 			$join   .= $clauses['join'];

wp-includes/comment.php

@@ -2459,6 +2459,15 @@ function wp_update_comment( $commentarr, $wp_error = false ) {
 		}
 	}
 
+	$filter_comment = false;
+	if ( ! has_filter( 'pre_comment_content', 'wp_filter_kses' ) ) {
+		$filter_comment = ! user_can( isset( $comment['user_id'] ) ? $comment['user_id'] : 0, 'unfiltered_html' );
+	}
+
+	if ( $filter_comment ) {
+		add_filter( 'pre_comment_content', 'wp_filter_kses' );
+	}
+
 	// Escape data pulled from DB.
 	$comment = wp_slash( $comment );
 
@@ -2469,6 +2478,10 @@ function wp_update_comment( $commentarr, $wp_error = false ) {
 
 	$commentarr = wp_filter_comment( $commentarr );
 
+	if ( $filter_comment ) {
+		remove_filter( 'pre_comment_content', 'wp_filter_kses' );
+	}
+
 	// Now extract the merged array.
 	$data = wp_unslash( $commentarr );
 

wp-includes/customize/class-wp-customize-header-image-control.php

@@ -130,10 +130,10 @@ class WP_Customize_Header_Image_Control extends WP_Customize_Image_Control {
 			<# } else { #>
 
 			<button type="button" class="choice thumbnail"
-				data-customize-image-value="{{{data.header.url}}}"
+				data-customize-image-value="{{data.header.url}}"
 				data-customize-header-image-data="{{JSON.stringify(data.header)}}">
 				<span class="screen-reader-text"><?php _e( 'Set image' ); ?></span>
-				<img src="{{{data.header.thumbnail_url}}}" alt="{{{data.header.alt_text || data.header.description}}}" />
+				<img src="{{data.header.thumbnail_url}}" alt="{{data.header.alt_text || data.header.description}}" />
 			</button>
 
 			<# if ( data.type === 'uploaded' ) { #>
@@ -158,7 +158,7 @@ class WP_Customize_Header_Image_Control extends WP_Customize_Image_Control {
 
 				<# } else { #>
 
-			<img src="{{{data.header.thumbnail_url}}}" alt="{{{data.header.alt_text || data.header.description}}}" />
+			<img src="{{data.header.thumbnail_url}}" alt="{{data.header.alt_text || data.header.description}}" />
 
 				<# } #>
 			<# } else { #>

wp-includes/customize/class-wp-customize-site-icon-control.php

@@ -68,7 +68,7 @@ class WP_Customize_Site_Icon_Control extends WP_Customize_Cropped_Image_Control
 							<div class="favicon">
 								<img src="{{ data.attachment.sizes.full ? data.attachment.sizes.full.url : data.attachment.url }}" alt="<?php esc_attr_e( 'Preview as a browser icon' ); ?>"/>
 							</div>
-							<span class="browser-title" aria-hidden="true"><# print( '<?php bloginfo( 'name' ); ?>' ) #></span>
+							<span class="browser-title" aria-hidden="true"><# print( '<?php echo esc_js( get_bloginfo( 'name' ) ); ?>' ) #></span>
 						</div>
 						<img class="app-icon-preview" src="{{ data.attachment.sizes.full ? data.attachment.sizes.full.url : data.attachment.url }}" alt="<?php esc_attr_e( 'Preview as an app icon' ); ?>"/>
 					</div>

wp-includes/deprecated.php

@@ -4135,3 +4135,21 @@ function wp_slash_strings_only( $value ) {
 function addslashes_strings_only( $value ) {
 	return is_string( $value ) ? addslashes( $value ) : $value;
 }
+
+/**
+ * Filter the SQL clauses of an attachment query to include filenames.
+ *
+ * @since 4.7.0
+ * @deprecated 6.0.3
+ * @access private
+ *
+ * @param array $clauses An array including WHERE, GROUP BY, JOIN, ORDER BY,
+ *                       DISTINCT, fields (SELECT), and LIMITS clauses.
+ * @return array The unmodified clauses.
+ */
+function _filter_query_attachment_filenames( $clauses ) {
+	_deprecated_function( __FUNCTION__, '6.0.3', 'add_filter( "wp_allow_query_attachment_by_filename", "__return_true" )');
+	remove_filter( 'posts_clauses', __FUNCTION__ );
+	return $clauses;
+}
+

wp-includes/functions.php

@@ -3287,10 +3287,12 @@ function wp_nonce_ays( $action ) {
 	} else {
 		$html = __( 'The link you followed has expired.' );
 		if ( wp_get_referer() ) {
+			$wp_http_referer = remove_query_arg( 'updated', wp_get_referer() );
+			$wp_http_referer = wp_validate_redirect( esc_url_raw( $wp_http_referer ) );
 			$html .= '</p><p>';
 			$html .= sprintf(
 				'<a href="%s">%s</a>',
-				esc_url( remove_query_arg( 'updated', wp_get_referer() ) ),
+				esc_url( $wp_http_referer ),
 				__( 'Please try again.' )
 			);
 		}

wp-includes/media-template.php

@@ -1493,7 +1493,7 @@ function wp_print_media_templates() {
 			<div class="favicon">
 				<img id="preview-favicon" src="{{ data.url }}" alt="<?php esc_attr_e( 'Preview as a browser icon' ); ?>"/>
 			</div>
-			<span class="browser-title" aria-hidden="true"><# print( '<?php bloginfo( 'name' ); ?>' ) #></span>
+			<span class="browser-title" aria-hidden="true"><# print( '<?php echo esc_js( get_bloginfo( 'name' ) ); ?>' ) #></span>
 		</div>
 
 		<strong aria-hidden="true"><?php _e( 'As an app icon' ); ?></strong>

wp-includes/pluggable.php

@@ -317,6 +317,8 @@ if ( ! function_exists( 'wp_mail' ) ) :
 		$phpmailer->clearAttachments();
 		$phpmailer->clearCustomHeaders();
 		$phpmailer->clearReplyTos();
+		$phpmailer->Body    = '';
+		$phpmailer->AltBody = '';
 
 		// Set "From" name and email.
 

wp-includes/post.php

@@ -1987,6 +1987,7 @@ function set_post_type( $post_id = 0, $post_type = 'post' ) {
  * @since 4.4.0
  * @since 4.5.0 Added the ability to pass a post type name in addition to object.
  * @since 4.6.0 Converted the `$post_type` parameter to accept a `WP_Post_Type` object.
+ * @since 5.9.0 Added `is_post_type_viewable` hook to filter the result.
  *
  * @param string|WP_Post_Type $post_type Post type name or object.
  * @return bool Whether the post type should be considered viewable.
@@ -1994,12 +1995,105 @@ function set_post_type( $post_id = 0, $post_type = 'post' ) {
 function is_post_type_viewable( $post_type ) {
 	if ( is_scalar( $post_type ) ) {
 		$post_type = get_post_type_object( $post_type );
+
 		if ( ! $post_type ) {
 			return false;
 		}
 	}
 
-	return $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );
+	if ( ! is_object( $post_type ) ) {
+		return false;
+	}
+
+	$is_viewable = $post_type->publicly_queryable || ( $post_type->_builtin && $post_type->public );
+
+	/**
+	 * Filters whether a post type is considered "viewable".
+	 *
+	 * The returned filtered value must be a boolean type to ensure
+	 * `is_post_type_viewable()` only returns a boolean. This strictness
+	 * is by design to maintain backwards-compatibility and guard against
+	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
+	 * and truthy values) will result in the function returning false.
+	 *
+	 * @since 5.9.0
+	 *
+	 * @param bool         $is_viewable Whether the post type is "viewable" (strict type).
+	 * @param WP_Post_Type $post_type   Post type object.
+	 */
+	return true === apply_filters( 'is_post_type_viewable', $is_viewable, $post_type );
+}
+
+/**
+ * Determines whether a post status is considered "viewable".
+ *
+ * For built-in post statuses such as publish and private, the 'public' value will be evaluated.
+ * For all others, the 'publicly_queryable' value will be used.
+ *
+ * @since 5.7.0
+ * @since 5.9.0 Added `is_post_status_viewable` hook to filter the result.
+ *
+ * @param string|stdClass $post_status Post status name or object.
+ * @return bool Whether the post status should be considered viewable.
+ */
+function is_post_status_viewable( $post_status ) {
+	if ( is_scalar( $post_status ) ) {
+		$post_status = get_post_status_object( $post_status );
+
+		if ( ! $post_status ) {
+			return false;
+		}
+	}
+
+	if (
+		! is_object( $post_status ) ||
+		$post_status->internal ||
+		$post_status->protected
+	) {
+		return false;
+	}
+
+	$is_viewable = $post_status->publicly_queryable || ( $post_status->_builtin && $post_status->public );
+
+	/**
+	 * Filters whether a post status is considered "viewable".
+	 *
+	 * The returned filtered value must be a boolean type to ensure
+	 * `is_post_status_viewable()` only returns a boolean. This strictness
+	 * is by design to maintain backwards-compatibility and guard against
+	 * potential type errors in PHP 8.1+. Non-boolean values (even falsey
+	 * and truthy values) will result in the function returning false.
+	 *
+	 * @since 5.9.0
+	 *
+	 * @param bool     $is_viewable Whether the post status is "viewable" (strict type).
+	 * @param stdClass $post_status Post status object.
+	 */
+	return true === apply_filters( 'is_post_status_viewable', $is_viewable, $post_status );
+}
+
+/**
+ * Determines whether a post is publicly viewable.
+ *
+ * Posts are considered publicly viewable if both the post status and post type
+ * are viewable.
+ *
+ * @since 5.7.0
+ *
+ * @param int|WP_Post|null $post Optional. Post ID or post object. Defaults to global $post.
+ * @return bool Whether the post is publicly viewable.
+ */
+function is_post_publicly_viewable( $post = null ) {
+	$post = get_post( $post );
+
+	if ( ! $post ) {
+		return false;
+	}
+
+	$post_type   = get_post_type( $post );
+	$post_status = get_post_status( $post );
+
+	return is_post_type_viewable( $post_type ) && is_post_status_viewable( $post_status );
 }
 
 /**
@@ -7474,36 +7568,6 @@ function wp_add_trashed_suffix_to_post_name_for_post( $post ) {
 	return $post_name;
 }
 
-/**
- * Filters the SQL clauses of an attachment query to include filenames.
- *
- * @since 4.7.0
- * @access private
- *
- * @global wpdb $wpdb WordPress database abstraction object.
- *
- * @param string[] $clauses An array including WHERE, GROUP BY, JOIN, ORDER BY,
- *                          DISTINCT, fields (SELECT), and LIMITS clauses.
- * @return string[] The modified array of clauses.
- */
-function _filter_query_attachment_filenames( $clauses ) {
-	global $wpdb;
-	remove_filter( 'posts_clauses', __FUNCTION__ );
-
-	// Add a LEFT JOIN of the postmeta table so we don't trample existing JOINs.
-	$clauses['join'] .= " LEFT JOIN {$wpdb->postmeta} AS sq1 ON ( {$wpdb->posts}.ID = sq1.post_id AND sq1.meta_key = '_wp_attached_file' )";
-
-	$clauses['groupby'] = "{$wpdb->posts}.ID";
-
-	$clauses['where'] = preg_replace(
-		"/\({$wpdb->posts}.post_content (NOT LIKE|LIKE) (\'[^']+\')\)/",
-		'$0 OR ( sq1.meta_value $1 $2 )',
-		$clauses['where']
-	);
-
-	return $clauses;
-}
-
 /**
  * Sets the last changed time for the 'posts' cache group.
  *

wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php

@@ -89,7 +89,7 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 
 		// Filter query clauses to include filenames.
 		if ( isset( $query_args['s'] ) ) {
-			add_filter( 'posts_clauses', '_filter_query_attachment_filenames' );
+			add_filter( 'wp_allow_query_attachment_by_filename', '__return_true' );
 		}
 
 		return $query_args;

wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php

@@ -134,6 +134,35 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 		);
 	}
 
+	/**
+	 * Checks if the terms for a post can be read.
+	 *
+	 * @since 6.0.3
+	 *
+	 * @param WP_Post         $post    Post object.
+	 * @param WP_REST_Request $request Full details about the request.
+	 * @return bool Whether the terms for the post can be read.
+	 */
+	public function check_read_terms_permission_for_post( $post, $request ) {
+		// If the requested post isn't associated with this taxonomy, deny access.
+		if ( ! is_object_in_taxonomy( $post->post_type, $this->taxonomy ) ) {
+			return false;
+		}
+
+		// Grant access if the post is publicly viewable.
+		if ( is_post_publicly_viewable( $post ) ) {
+			return true;
+		}
+
+		// Otherwise grant access if the post is readable by the logged in user.
+		if ( current_user_can( 'read_post', $post->ID ) ) {
+			return true;
+		}
+
+		// Otherwise, deny access.
+		return false;
+	}
+
 	/**
 	 * Checks if a request has access to read terms in the specified taxonomy.
 	 *
@@ -157,6 +186,30 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 			);
 		}
 
+		if ( ! empty( $request['post'] ) ) {
+			$post = get_post( $request['post'] );
+
+			if ( ! $post ) {
+				return new WP_Error(
+					'rest_post_invalid_id',
+					__( 'Invalid post ID.' ),
+					array(
+						'status' => 400,
+					)
+				);
+			}
+
+			if ( ! $this->check_read_terms_permission_for_post( $post, $request ) ) {
+				return new WP_Error(
+					'rest_forbidden_context',
+					__( 'Sorry, you are not allowed to view terms for this post.' ),
+					array(
+						'status' => rest_authorization_required_code(),
+					)
+				);
+			}
+		}
+
 		return true;
 	}
 

wp-includes/widgets.php

@@ -1522,7 +1522,7 @@ function wp_widget_rss_output( $rss, $args = array() ) {
 
 	if ( is_wp_error( $rss ) ) {
 		if ( is_admin() || current_user_can( 'manage_options' ) ) {
-			echo '<p><strong>' . __( 'RSS Error:' ) . '</strong> ' . $rss->get_error_message() . '</p>';
+			echo '<p><strong>' . __( 'RSS Error:' ) . '</strong> ' . esc_html( $rss->get_error_message() ) . '</p>';
 		}
 		return;
 	}
@@ -1645,7 +1645,7 @@ function wp_widget_rss_form( $args, $inputs = null ) {
 	$args['show_date']    = isset( $args['show_date'] ) ? (int) $args['show_date'] : (int) $inputs['show_date'];
 
 	if ( ! empty( $args['error'] ) ) {
-		echo '<p class="widget-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . $args['error'] . '</p>';
+		echo '<p class="widget-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . esc_html( $args['error'] ) . '</p>';
 	}
 
 	$esc_number = esc_attr( $args['number'] );

wp-mail.php

@@ -65,6 +65,9 @@ if ( 0 === $count ) {
 	wp_die( __( 'There doesn’t seem to be any new mail.' ) );
 }
 
+// Always run as an unauthenticated user.
+wp_set_current_user( 0 );
+
 for ( $i = 1; $i <= $count; $i++ ) {
 
 	$message = $pop3->get( $i );
@@ -131,8 +134,6 @@ for ( $i = 1; $i <= $count; $i++ ) {
 				}
 				$author = sanitize_email( $author );
 				if ( is_email( $author ) ) {
-					/* translators: %s: Post author email address. */
-					echo '<p>' . sprintf( __( 'Author is %s' ), $author ) . '</p>';
 					$userdata = get_user_by( 'email', $author );
 					if ( ! empty( $userdata ) ) {
 						$post_author  = $userdata->ID;

wp-trackback.php

@@ -13,6 +13,9 @@ if ( empty( $wp ) ) {
 	wp( array( 'tb' => '1' ) );
 }
 
+// Always run as an unauthenticated user.
+wp_set_current_user( 0 );
+
 /**
  * Response to a trackback.
  *