diff --git a/src/wp-includes/cache.php b/src/wp-includes/cache.php
index 9ee0dcddda..cedd845b85 100644
--- a/src/wp-includes/cache.php
+++ b/src/wp-includes/cache.php
@@ -691,7 +691,7 @@ class WP_Object_Cache {
 		echo "</p>";
 		echo '<ul>';
 		foreach ($this->cache as $group => $cache) {
-			echo "<li><strong>Group:</strong> $group - ( " . number_format( strlen( serialize( $cache ) ) / KB_IN_BYTES, 2 ) . 'k )</li>';
+			echo '<li><strong>Group:</strong> ' . esc_html( $group ) . ' - ( ' . number_format( strlen( serialize( $cache ) ) / KB_IN_BYTES, 2 ) . 'k )</li>';
 		}
 		echo '</ul>';
 	}
diff --git a/src/wp-includes/formatting.php b/src/wp-includes/formatting.php
index 42642f63c5..7e0d35ab6e 100644
--- a/src/wp-includes/formatting.php
+++ b/src/wp-includes/formatting.php
@@ -1375,6 +1375,24 @@ function remove_accents( $string ) {
 function sanitize_file_name( $filename ) {
 	$filename_raw = $filename;
 	$special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}", "%", "+", chr(0));
+
+	// Check for support for utf8 in the installed PCRE library once and store the result in a static.
+	static $utf8_pcre = null;
+	if ( ! isset( $utf8_pcre ) ) {
+		// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
+		$utf8_pcre = @preg_match( '/^./u', 'a' );
+	}
+
+	if ( ! seems_utf8( $filename ) ) {
+		$_ext     = pathinfo( $filename, PATHINFO_EXTENSION );
+		$_name    = pathinfo( $filename, PATHINFO_FILENAME );
+		$filename = sanitize_title_with_dashes( $_name ) . '.' . $_ext;
+	}
+
+	if ( $utf8_pcre ) {
+		$filename = preg_replace( "#\x{00a0}#siu", ' ', $filename );
+	}
+
 	/**
 	 * Filter the list of characters to remove from a filename.
 	 *
@@ -1384,7 +1402,6 @@ function sanitize_file_name( $filename ) {
 	 * @param string $filename_raw  Filename as it was passed into sanitize_file_name().
 	 */
 	$special_chars = apply_filters( 'sanitize_file_name_chars', $special_chars, $filename_raw );
-	$filename = preg_replace( "#\x{00a0}#siu", ' ', $filename );
 	$filename = str_replace( $special_chars, '', $filename );
 	$filename = str_replace( array( '%20', '+' ), '-', $filename );
 	$filename = preg_replace( '/[\r\n\t -]+/', '-', $filename );
diff --git a/src/wp-includes/query.php b/src/wp-includes/query.php
index 7ece668f57..c473aaed97 100644
--- a/src/wp-includes/query.php
+++ b/src/wp-includes/query.php
@@ -1663,10 +1663,6 @@ class WP_Query {
 			$this->is_single = true;
 		} elseif ( $qv['p'] ) {
 			$this->is_single = true;
-		} elseif ( ('' !== $qv['hour']) && ('' !== $qv['minute']) &&('' !== $qv['second']) && ('' != $qv['year']) && ('' != $qv['monthnum']) && ('' != $qv['day']) ) {
-			// If year, month, day, hour, minute, and second are set, a single
-			// post is being queried.
-			$this->is_single = true;
 		} elseif ( '' != $qv['pagename'] || !empty($qv['page_id']) ) {
 			$this->is_page = true;
 			$this->is_single = false;
diff --git a/src/wp-includes/user.php b/src/wp-includes/user.php
index 0ef9fdfb47..59cc774db4 100644
--- a/src/wp-includes/user.php
+++ b/src/wp-includes/user.php
@@ -1497,7 +1497,7 @@ function wp_insert_user( $userdata ) {
 	$data = wp_unslash( $compacted );
 
 	if ( $update ) {
-		if ( $user_email !== $old_user_data->user_email ) {
+		if ( $user_email !== $old_user_data->user_email || $user_pass !== $old_user_data->user_pass ) {
 			$data['user_activation_key'] = '';
 		}
 		$wpdb->update( $wpdb->users, $data, compact( 'ID' ) );
diff --git a/tests/phpunit/tests/formatting/SanitizeFileName.php b/tests/phpunit/tests/formatting/SanitizeFileName.php
index d26b87134e..4db64c3c6a 100644
--- a/tests/phpunit/tests/formatting/SanitizeFileName.php
+++ b/tests/phpunit/tests/formatting/SanitizeFileName.php
@@ -67,4 +67,20 @@ class Tests_Formatting_SanitizeFileName extends WP_UnitTestCase {
 		// Test a filenames that becomes extensionless.
 		$this->assertEquals( 'no-extension', sanitize_file_name( '_.no-extension' ) );
 	}
+
+	/**
+	 * @dataProvider data_wp_filenames
+	 */
+	function test_replaces_invalid_utf8_characters( $input, $expected ) {
+		$this->assertEquals( $expected, sanitize_file_name( $input ) );
+	}
+
+	function data_wp_filenames() {
+		return array(
+			array( urldecode( '%B1myfile.png' ), 'myfile.png' ),
+			array( urldecode( '%B1myfile' ), 'myfile' ),
+			array( 'demo bar.png', 'demo-bar.png' ),
+			array( 'demo' . json_decode( '"\u00a0"' ) . 'bar.png', 'demo-bar.png' ),
+		);
+	}
 }
diff --git a/tests/phpunit/tests/user.php b/tests/phpunit/tests/user.php
index c55fa6d347..70e4794c91 100644
--- a/tests/phpunit/tests/user.php
+++ b/tests/phpunit/tests/user.php
@@ -902,7 +902,7 @@ class Tests_User extends WP_UnitTestCase {
 		$this->assertWPError( $u );
 	}
 
-	function test_changing_email_invalidates_password_reset_key() {
+	public function test_changing_email_invalidates_password_reset_key() {
 		global $wpdb;
 
 		$user = $this->author;
@@ -934,6 +934,26 @@ class Tests_User extends WP_UnitTestCase {
 		$this->assertEmpty( $user->user_activation_key );
 	}
 
+	public function test_changing_password_invalidates_password_reset_key() {
+		global $wpdb;
+
+		$user = $this->author;
+		$wpdb->update( $wpdb->users, array( 'user_activation_key' => 'key' ), array( 'ID' => $user->ID ) );
+		clean_user_cache( $user );
+
+		$user = get_userdata( $user->ID );
+		$this->assertEquals( 'key', $user->user_activation_key );
+
+		$userdata = array(
+			'ID'        => $user->ID,
+			'user_pass' => 'password',
+		);
+		wp_update_user( $userdata );
+
+		$user = get_userdata( $user->ID );
+		$this->assertEmpty( $user->user_activation_key );
+	}
+
 	public function test_search_users_login() {
 		$users = get_users( array( 'search' => 'user1', 'fields' => 'ID' ) );