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<title>[57251] trunk: Taxonomy: Check for empty term after DB sanitization in `wp_insert_term()`.</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/57251">57251</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/57251","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>SergeyBiryukov</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2024-01-08 22:42:49 +0000 (Mon, 08 Jan 2024)</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'>Taxonomy: Check for empty term after DB sanitization in `wp_insert_term()`.
When inserting a new term in the database, `wp_insert_term()` will check if the term is empty and return a corresponding error.
Afterwards the term is sanitized and inserted in the database. However, there is a chance the term is empty after the DB sanitization.
This commit adds a check for an empty term name after the term is sanitized, returning an error in that case.
Follow-up to <a href="https://core.trac.wordpress.org/changeset/5726">[5726]</a>, <a href="https://core.trac.wordpress.org/changeset/8393">[8393]</a>.
Props fgiannar, kraftbj.
Fixes <a href="https://core.trac.wordpress.org/ticket/59995">#59995</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludestaxonomyphp">trunk/src/wp-includes/taxonomy.php</a></li>
<li><a href="#trunktestsphpunitteststermwpInsertTermphp">trunk/tests/phpunit/tests/term/wpInsertTerm.php</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunksrcwpincludestaxonomyphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/taxonomy.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/taxonomy.php 2024-01-08 18:36:56 UTC (rev 57250)
+++ trunk/src/wp-includes/taxonomy.php 2024-01-08 22:42:49 UTC (rev 57251)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -2434,6 +2434,11 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $description = wp_unslash( $args['description'] );
</span><span class="cx" style="display: block; padding: 0 10px"> $parent = (int) $args['parent'];
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ // Sanitization could clean the name to an empty string that must be checked again.
+ if ( '' === $name ) {
+ return new WP_Error( 'invalid_term_name', __( 'Invalid term name.' ) );
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> $slug_provided = ! empty( $args['slug'] );
</span><span class="cx" style="display: block; padding: 0 10px"> if ( ! $slug_provided ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $slug = sanitize_title( $name );
</span></span></pre></div>
<a id="trunktestsphpunitteststermwpInsertTermphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/term/wpInsertTerm.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/term/wpInsertTerm.php 2024-01-08 18:36:56 UTC (rev 57250)
+++ trunk/tests/phpunit/tests/term/wpInsertTerm.php 2024-01-08 22:42:49 UTC (rev 57251)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -895,6 +895,19 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $this->assertSame( '', $term_object->description );
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ /**
+ * @ticket 59995
+ */
+ public function test_wp_insert_term_with_empty_name_after_db_sanitization() {
+ $term = wp_insert_term(
+ '<script>onclick=alert("hello")</script>',
+ 'post_tag'
+ );
+
+ $this->assertWPError( $term );
+ $this->assertSame( 'invalid_term_name', $term->get_error_code() );
+ }
+
</ins><span class="cx" style="display: block; padding: 0 10px"> /** Helpers */
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> public function deleted_term_cb( $term, $tt_id, $taxonomy, $deleted_term, $object_ids ) {
</span></span></pre>
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