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Editing: class-wp-simplepie-sanitize-kses.php

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<?php
/**
 * Feed API: WP_SimplePie_Sanitize_KSES class
 *
 * @package WordPress
 * @subpackage Feed
 * @since 4.7.0
 */

// Don't load directly.
if ( ! defined( 'ABSPATH' ) ) {
	die( '-1' );
}

/**
 * Core class used to implement SimplePie feed sanitization.
 *
 * Extends the SimplePie\Sanitize class to use KSES, because
 * we cannot universally count on DOMDocument being available.
 *
 * @since 3.5.0
 */
#[AllowDynamicProperties]
class WP_SimplePie_Sanitize_KSES extends SimplePie\Sanitize {

/**
	 * WordPress SimplePie sanitization using KSES.
	 *
	 * Sanitizes the incoming data, to ensure that it matches the type of data expected, using KSES.
	 *
	 * @since 3.5.0
	 *
	 * @param mixed   $data The data that needs to be sanitized.
	 * @param int     $type The type of data that it's supposed to be.
	 * @param string  $base Optional. The `xml:base` value to use when converting relative
	 *                      URLs to absolute ones. Default empty.
	 * @return mixed Sanitized data.
	 */
	public function sanitize( $data, $type, $base = '' ) {
		$data = trim( $data );
		if ( $type & SimplePie\SimplePie::CONSTRUCT_MAYBE_HTML ) {
			if ( preg_match( '/(&(#(x[0-9a-fA-F]+|[0-9]+)|[a-zA-Z0-9]+)|<\/[A-Za-z][^\x09\x0A\x0B\x0C\x0D\x20\x2F\x3E]*' . SIMPLEPIE_PCRE_HTML_ATTRIBUTE . '>)/', $data ) ) {
				$type |= SimplePie\SimplePie::CONSTRUCT_HTML;
			} else {
				$type |= SimplePie\SimplePie::CONSTRUCT_TEXT;
			}
		}
		if ( $type & SimplePie\SimplePie::CONSTRUCT_BASE64 ) {
			$data = base64_decode( $data );
		}
		if ( $type & ( SimplePie\SimplePie::CONSTRUCT_HTML | \SimplePie\SimplePie::CONSTRUCT_XHTML ) ) {
			$data = wp_kses_post( $data );
			if ( 'UTF-8' !== $this->output_encoding ) {
				$data = $this->registry->call( 'Misc', 'change_encoding', array( $data, 'UTF-8', $this->output_encoding ) );
			}
			return $data;
		} else {
			return parent::sanitize( $data, $type, $base );
		}
	}
}

Editing: class-wp-simplepie-sanitize-kses.php

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