diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 82b19ec8f1..676eacbe38 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -2981,8 +2981,9 @@ function wp_get_default_extension_for_mime_type( $mime_type ) {
  * You can optionally define the mime array, if needed.
  *
  * @since 2.0.4
+ * @since 6.0.0 URLs are now supported.
  *
- * @param string   $filename File name or path.
+ * @param string   $filename File name, path, or URL.
  * @param string[] $mimes    Optional. Array of allowed mime types keyed by their file extension regex.
  * @return array {
  *     Values for the extension and mime type.
@@ -2998,6 +2999,15 @@ function wp_check_filetype( $filename, $mimes = null ) {
 	$type = false;
 	$ext  = false;
 
+	// Strip query args and fragment from filename to reveal extension.
+	$query_pos = strpos( $filename, '?' );
+
+	if ( false !== $query_pos ) {
+		$filename = substr_replace( $filename, '', $query_pos );
+	}
+
+	$filename = strip_fragment_from_url( $filename );
+
 	foreach ( $mimes as $ext_preg => $mime_match ) {
 		$ext_preg = '!\.(' . $ext_preg . ')$!i';
 		if ( preg_match( $ext_preg, $filename, $ext_matches ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 21c7d411db..bf450968e3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52828';
+$wp_version = '6.0-alpha-52829';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.