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<title>[44016] KSES: Conditionally remove the `<form>` element from `$allowedposttags`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/44016">44016</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/44016","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>pento</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2018-12-12 23:57:07 +0000 (Wed, 12 Dec 2018)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>KSES: Conditionally remove the `<form>` element from `$allowedposttags`.
To avoid backwards compatibility issues, `<form>` is re-added if a custom filter has added the `<input>` or `<select>` elements to `$allowedposttags`.
Merges <a href="https://core.trac.wordpress.org/changeset/43994">[43994]</a> to the 3.9 branch.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#branches39srcwpincludesksesphp">branches/3.9/src/wp-includes/kses.php</a></li>
</ul>
<h3>Property Changed</h3>
<ul>
<li><a href="#branches39">branches/3.9/</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<span class="cx" style="display: block; padding: 0 10px">Index: branches/3.9
</span><span class="cx" style="display: block; padding: 0 10px">===================================================================
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">--- branches/3.9 2018-12-12 23:54:55 UTC (rev 44015)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+++ branches/3.9 2018-12-12 23:57:07 UTC (rev 44016)
</ins><a id="branches39"></a>
<div class="propset"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Property changes: branches/3.9</h4>
<pre class="diff"><span>
</span></pre></div>
<a id="svnmergeinfo"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: svn:mergeinfo</h4></div>
<span class="cx" style="display: block; padding: 0 10px"> /branches/4.6:38615,41414
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/4.8:42478
</span><span class="cx" style="display: block; padding: 0 10px"> /branches/4.9:42434
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-/branches/5.0:43988
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/branches/5.0:43988,43994
</ins><span class="cx" style="display: block; padding: 0 10px"> /trunk:28158,28161,28163,28165-28166,28168-28169,28171-28174,28176-28187,28189-28191,28193-28195,28203,28219,28223,28266,28269,28275-28276,28280,28284,29327,29377-29378,29381-29382,29397,29404,29631,29783,30412,30417,30422,30425,30430,30435,30438,30443,30458,30466,33124,33142,36083,36435,37651,38524,39645,39659,39759,39772,39795,39807-39808,39831,39850,39956,40148,40169,40183,40241,40400,40604,40677,40692,40704,40723,40736,41072,41393,41398,41457,41470,41483,41496,41522,41662,42056,42119-42120,42258-42261,42424,42433,42892-42893
</span><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of property
</span><a id="branches39srcwpincludesksesphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: branches/3.9/src/wp-includes/kses.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- branches/3.9/src/wp-includes/kses.php 2018-12-12 23:54:55 UTC (rev 44015)
+++ branches/3.9/src/wp-includes/kses.php 2018-12-12 23:57:07 UTC (rev 44016)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -160,15 +160,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 'lang' => true,
</span><span class="cx" style="display: block; padding: 0 10px"> 'xml:lang' => true,
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- 'form' => array(
- 'action' => true,
- 'accept' => true,
- 'accept-charset' => true,
- 'enctype' => true,
- 'method' => true,
- 'name' => true,
- 'target' => true,
- ),
</del><span class="cx" style="display: block; padding: 0 10px"> 'h1' => array(
</span><span class="cx" style="display: block; padding: 0 10px"> 'align' => true,
</span><span class="cx" style="display: block; padding: 0 10px"> ),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -569,6 +560,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> * Return a list of allowed tags and attributes for a given context.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 3.5.0
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @since 5.0.1 `form` removed as allowable HTML tag.
</ins><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @param string $context The context for which to retrieve tags. Allowed values are
</span><span class="cx" style="display: block; padding: 0 10px"> * post | strip | data | entities or the name of a field filter such as pre_user_description.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -593,8 +585,27 @@
</span><span class="cx" style="display: block; padding: 0 10px"> switch ( $context ) {
</span><span class="cx" style="display: block; padding: 0 10px"> case 'post':
</span><span class="cx" style="display: block; padding: 0 10px"> /** This filter is documented in wp-includes/kses.php */
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- return apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );
- break;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );
+
+ // 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`.
+ if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) {
+ $tags = $allowedposttags;
+
+ $tags['form'] = array(
+ 'action' => true,
+ 'accept' => true,
+ 'accept-charset' => true,
+ 'enctype' => true,
+ 'method' => true,
+ 'name' => true,
+ 'target' => true,
+ );
+
+ /** This filter is documented in wp-includes/kses.php */
+ $tags = apply_filters( 'wp_kses_allowed_html', $tags, $context );
+ }
+
+ return $tags;
</ins><span class="cx" style="display: block; padding: 0 10px"> case 'user_description':
</span><span class="cx" style="display: block; padding: 0 10px"> case 'pre_user_description':
</span><span class="cx" style="display: block; padding: 0 10px"> $tags = $allowedtags;
</span></span></pre>
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