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Query: Add is_scalar validation for attachment and post type query vars #11650

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Query: Add is_scalar validation for attachment and post type query vars #11650

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1641032
fix: prevent fatal error with malformed post type query vars
Sukhendu2002 Apr 27, 2026
1eff3fb
Tests: Add tests for malformed post type query vars handling
Sukhendu2002 Apr 27, 2026
5474cfa
Merge branch 'trunk' into fix/65123-malformed-post-type-query-var-fatal
Sukhendu2002 Apr 27, 2026
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16 changes: 13 additions & 3 deletions src/wp-includes/class-wp-query.php
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Original file line number Diff line number Diff line change
Expand Up @@ -878,6 +878,10 @@ public function parse_query( $query = '' ) {

$query_vars['attachment_id'] = is_scalar( $query_vars['attachment_id'] ) ? absint( $query_vars['attachment_id'] ) : 0;

if ( ! is_scalar( $query_vars['attachment'] ) ) {
$query_vars['attachment'] = '';
}

if ( ( '' !== $query_vars['attachment'] ) || ! empty( $query_vars['attachment_id'] ) ) {
$this->is_single = true;
$this->is_attachment = true;
Expand Down Expand Up @@ -2152,11 +2156,17 @@ public function get_posts() {

if ( ! $ptype_obj->hierarchical ) {
// Non-hierarchical post types can directly use 'name'.
$query_vars['name'] = $query_vars[ $ptype_obj->query_var ];
if ( is_scalar( $query_vars[ $ptype_obj->query_var ] ) ) {
$query_vars['name'] = $query_vars[ $ptype_obj->query_var ];
} else {
$query_vars['name'] = '';
}
} else {
// Hierarchical post types will operate through 'pagename'.
$query_vars['pagename'] = $query_vars[ $ptype_obj->query_var ];
$query_vars['name'] = '';
if ( is_scalar( $query_vars[ $ptype_obj->query_var ] ) ) {
$query_vars['pagename'] = $query_vars[ $ptype_obj->query_var ];
}
$query_vars['name'] = '';
}

// Only one request for a slug is possible, this is why name & pagename are overwritten above.
Expand Down
62 changes: 62 additions & 0 deletions tests/phpunit/tests/query/parseQuery.php
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Original file line number Diff line number Diff line change
Expand Up @@ -234,6 +234,68 @@ public function test_parse_query_attachment_id_nonscalar() {
$this->assertEmpty( $q->query_vars['attachment_id'] );
}

/**
* Ensure non-scalar 'attachment' value is rejected and attachment flags are not set.
*
* @ticket 65123
*/
public function test_parse_query_attachment_nonscalar() {
$q = new WP_Query();
$q->parse_query(
array(
'attachment' => array( 'foo' => 'bar' ),
)
);

$this->assertEmpty( $q->query_vars['attachment'] );
$this->assertFalse( $q->is_attachment );
$this->assertFalse( $q->is_single );
}

/**
* Ensure a string 'attachment' value sets is_attachment and is_single flags.
*
* @ticket 65123
*/
public function test_parse_query_attachment_scalar() {
$q = new WP_Query();
$q->parse_query(
array(
'attachment' => 'my-image',
)
);

$this->assertSame( 'my-image', $q->query_vars['attachment'] );
$this->assertTrue( $q->is_attachment );
$this->assertTrue( $q->is_single );
}

/**
* Ensure non-scalar post type query var does not cause a fatal error.
*
* @ticket 65123
*/
public function test_parse_query_post_type_query_var_array() {
register_post_type(
'wptests_cpt',
array(
'public' => true,
'query_var' => 'wptests_cpt',
)
);

$q = new WP_Query(
array(
'post_type' => 'wptests_cpt',
'wptests_cpt' => array( 'foo' => 'bar' ),
)
);

unregister_post_type( 'wptests_cpt' );

$this->assertIsArray( $q->posts );
}

/**
* Tests that a fatal error is not thrown when a hierarchical taxonomy query var
* passed to wp_basename() in ::parse_tax_query() is an array instead of a string.
Expand Down
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