diff --git a/src/wp-includes/html-api/class-wp-html-tag-processor.php b/src/wp-includes/html-api/class-wp-html-tag-processor.php
index 0cdcd4cd85531..85f2c569e6dff 100644
--- a/src/wp-includes/html-api/class-wp-html-tag-processor.php
+++ b/src/wp-includes/html-api/class-wp-html-tag-processor.php
@@ -1610,7 +1610,30 @@ private function skip_script_data(): bool {
 			 */
 			$at += 6;
 			$c   = $html[ $at ];
-			if ( ' ' !== $c && "\t" !== $c && "\r" !== $c && "\n" !== $c && '/' !== $c && '>' !== $c ) {
+			if (
+			/*
+			 * These characters trigger state transitions of interest:
+			 *
+			 * - @see {https://html.spec.whatwg.org/multipage/parsing.html#script-data-end-tag-name-state}
+			 * - @see {https://html.spec.whatwg.org/multipage/parsing.html#script-data-escaped-end-tag-name-state}
+			 * - @see {https://html.spec.whatwg.org/multipage/parsing.html#script-data-double-escape-start-state}
+			 * - @see {https://html.spec.whatwg.org/multipage/parsing.html#script-data-double-escape-end-state}
+			 *
+			 * The "\r" character is not present in the above references. However, "\r" must be
+			 * treated the same as "\n". This is because the HTML Standard requires newline
+			 * normalization during preprocessing which applies this replacement.
+			 *
+			 * - @see https://html.spec.whatwg.org/multipage/parsing.html#preprocessing-the-input-stream
+			 * - @see https://infra.spec.whatwg.org/#normalize-newlines
+			 */
+				'>' !== $c &&
+				' ' !== $c &&
+				"\n" !== $c &&
+				'/' !== $c &&
+				"\t" !== $c &&
+				"\f" !== $c &&
+				"\r" !== $c
+			) {
 				++$at;
 				continue;
 			}
diff --git a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
index 511586f99327c..33979e50beb50 100644
--- a/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
+++ b/tests/phpunit/tests/html-api/wpHtmlTagProcessor.php
@@ -2012,6 +2012,7 @@ public function test_script_tag_parsing( string $input, bool $closes ) {
 	public static function data_script_tag(): array {
 		return array(
 			'Basic script tag'                          => array( '<script></script>', true ),
+			'Basic script tag with </script\f> close'   => array( "<script></script\f>", true ),
 			'Script with type attribute'                => array( '<script type="text/javascript"></script>', true ),
 			'Script data escaped'                       => array( '<script><!--</script>', true ),
 			'Script data double-escaped exit (comment)' => array( '<script><!--<script>--></script>', true ),
@@ -2021,6 +2022,7 @@ public static function data_script_tag(): array {
 
 			'Script tag with self-close flag (ignored)' => array( '<script />', false ),
 			'Script data double-escaped'                => array( '<script><!--<script></script>', false ),
+			'Basic script tag double-escaped with <script\f' => array( "<script><!--<script\f</script>", false ),
 		);
 	}