diff --git a/packages/block-library/src/navigation/index.php b/packages/block-library/src/navigation/index.php
index e7f64aa3a311ed..87ea817270a391 100644
--- a/packages/block-library/src/navigation/index.php
+++ b/packages/block-library/src/navigation/index.php
@@ -746,7 +746,7 @@ function render_block_core_navigation( $attributes, $content, $block ) {
 		$toggle_aria_label_close,
 		esc_attr( implode( ' ', $responsive_container_classes ) ),
 		esc_attr( implode( ' ', $open_button_classes ) ),
-		safecss_filter_attr( $colors['overlay_inline_styles'] ),
+		esc_attr( safecss_filter_attr( $colors['overlay_inline_styles'] ) ),
 		__( 'Menu' ),
 		$toggle_button_content,
 		$toggle_close_button_content
diff --git a/packages/block-library/src/rss/index.php b/packages/block-library/src/rss/index.php
index 0edbc90490c314..e32155195af1db 100644
--- a/packages/block-library/src/rss/index.php
+++ b/packages/block-library/src/rss/index.php
@@ -20,7 +20,7 @@ function render_block_core_rss( $attributes ) {
 	$rss = fetch_feed( $attributes['feedURL'] );
 
 	if ( is_wp_error( $rss ) ) {
-		return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . $rss->get_error_message() . '</div></div>';
+		return '<div class="components-placeholder"><div class="notice notice-error"><strong>' . __( 'RSS Error:' ) . '</strong> ' . esc_html( $rss->get_error_message() ) . '</div></div>';
 	}
 
 	if ( ! $rss->get_item_quantity() ) {
@@ -48,8 +48,8 @@ function render_block_core_rss( $attributes ) {
 			if ( $date ) {
 				$date = sprintf(
 					'<time datetime="%1$s" class="wp-block-rss__item-publish-date">%2$s</time> ',
-					date_i18n( get_option( 'c' ), $date ),
-					date_i18n( get_option( 'date_format' ), $date )
+					esc_attr( date_i18n( get_option( 'c' ), $date ) ),
+					esc_attr( date_i18n( get_option( 'date_format' ), $date ) )
 				);
 			}
 		}
diff --git a/packages/block-library/src/search/index.php b/packages/block-library/src/search/index.php
index 61b2cf2b06b511..26b6a7585ccc7f 100644
--- a/packages/block-library/src/search/index.php
+++ b/packages/block-library/src/search/index.php
@@ -367,12 +367,12 @@ function styles_for_block_core_search( $attributes ) {
 	// Add color styles.
 	$has_text_color = ! empty( $attributes['style']['color']['text'] );
 	if ( $has_text_color ) {
-		$button_styles[] = sprintf( 'color: %s;', esc_attr( $attributes['style']['color']['text'] ) );
+		$button_styles[] = sprintf( 'color: %s;', $attributes['style']['color']['text'] );
 	}
 
 	$has_background_color = ! empty( $attributes['style']['color']['background'] );
 	if ( $has_background_color ) {
-		$button_styles[] = sprintf( 'background-color: %s;', esc_attr( $attributes['style']['color']['background'] ) );
+		$button_styles[] = sprintf( 'background-color: %s;', $attributes['style']['color']['background'] );
 	}
 
 	$has_custom_gradient = ! empty( $attributes['style']['color']['gradient'] );
@@ -399,9 +399,9 @@ function styles_for_block_core_search( $attributes ) {
 	}
 
 	return array(
-		'input'   => ! empty( $input_styles ) ? sprintf( ' style="%s"', safecss_filter_attr( implode( ' ', $input_styles ) ) ) : '',
-		'button'  => ! empty( $button_styles ) ? sprintf( ' style="%s"', safecss_filter_attr( implode( ' ', $button_styles ) ) ) : '',
-		'wrapper' => ! empty( $wrapper_styles ) ? sprintf( ' style="%s"', safecss_filter_attr( implode( ' ', $wrapper_styles ) ) ) : '',
+		'input'   => ! empty( $input_styles ) ? sprintf( ' style="%s"', esc_attr( safecss_filter_attr( implode( ' ', $input_styles ) ) ) ) : '',
+		'button'  => ! empty( $button_styles ) ? sprintf( ' style="%s"', esc_attr( safecss_filter_attr( implode( ' ', $button_styles ) ) ) ) : '',
+		'wrapper' => ! empty( $wrapper_styles ) ? sprintf( ' style="%s"', esc_attr( safecss_filter_attr( implode( ' ', $wrapper_styles ) ) ) ) : '',
 		'label'   => ! empty( $label_styles ) ? sprintf( ' style="%s"', esc_attr( safecss_filter_attr( implode( ' ', $label_styles ) ) ) ) : '',
 	);
 }
diff --git a/packages/widgets/src/blocks/legacy-widget/index.php b/packages/widgets/src/blocks/legacy-widget/index.php
index c3aa55fdfe241d..94cfb9ba71ebfd 100644
--- a/packages/widgets/src/blocks/legacy-widget/index.php
+++ b/packages/widgets/src/blocks/legacy-widget/index.php
@@ -34,7 +34,7 @@ function render_block_core_legacy_widget( $attributes ) {
 
 	if ( isset( $attributes['instance']['encoded'], $attributes['instance']['hash'] ) ) {
 		$serialized_instance = base64_decode( $attributes['instance']['encoded'] );
-		if ( wp_hash( $serialized_instance ) !== $attributes['instance']['hash'] ) {
+		if ( ! hash_equals( wp_hash( $serialized_instance ), (string) $attributes['instance']['hash'] ) ) {
 			return '';
 		}
 		$instance = unserialize( $serialized_instance );
diff --git a/packages/widgets/src/blocks/widget-group/index.php b/packages/widgets/src/blocks/widget-group/index.php
index 6cf6442346a306..8c8584b296d57e 100644
--- a/packages/widgets/src/blocks/widget-group/index.php
+++ b/packages/widgets/src/blocks/widget-group/index.php
@@ -28,7 +28,7 @@ function render_block_core_widget_group( $attributes, $content, $block ) {
 	$html = '';
 
 	if ( ! empty( $attributes['title'] ) ) {
-		$html .= $before_title . $attributes['title'] . $after_title;
+		$html .= $before_title . esc_html( $attributes['title'] ) . $after_title;
 	}
 
 	$html .= '<div class="wp-widget-group__inner-blocks">';