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Ignore:
Timestamp:
12/12/2018 11:39:39 PM (16 months ago)
Author:
pento
Message:

KSES: Conditionally remove the <form> element from $allowedposttags.

To avoid backwards compatibility issues, <form> is re-added if a custom filter has added the <input> or <select> elements to $allowedposttags.

Merges [43994] to the 4.2 branch.

Location:
branches/4.2
Files:
2 edited

Legend:

Unmodified
Added
Removed
  • branches/4.2

  • branches/4.2/src/wp-includes/kses.php

    r33360 r44008  
    180180            'lang' => true,
    181181            'xml:lang' => true,
    182         ),
    183         'form' => array(
    184             'action' => true,
    185             'accept' => true,
    186             'accept-charset' => true,
    187             'enctype' => true,
    188             'method' => true,
    189             'name' => true,
    190             'target' => true,
    191182        ),
    192183        'h1' => array(
     
    609600 *
    610601 * @since 3.5.0
     602 * @since 5.0.1 `form` removed as allowable HTML tag.
    611603 *
    612604 * @param string $context The context for which to retrieve tags. Allowed values are
     
    633625        case 'post':
    634626            /** This filter is documented in wp-includes/kses.php */
    635             return apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );
     627            $tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );
     628
     629            // 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`.
     630            if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) {
     631                $tags = $allowedposttags;
     632
     633                $tags['form'] = array(
     634                    'action' => true,
     635                    'accept' => true,
     636                    'accept-charset' => true,
     637                    'enctype' => true,
     638                    'method' => true,
     639                    'name' => true,
     640                    'target' => true,
     641                );
     642
     643                /** This filter is documented in wp-includes/kses.php */
     644                $tags = apply_filters( 'wp_kses_allowed_html', $tags, $context );
     645            }
     646
     647            return $tags;
    636648
    637649        case 'user_description':
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