diff --git a/2meet-data-optimizer.php b/2meet-data-optimizer.php
index de1693f..defb69a 100644
--- a/2meet-data-optimizer.php
+++ b/2meet-data-optimizer.php
@@ -3,7 +3,7 @@
  * Plugin Name:       2meet Data Optimizer
  * Plugin URI:        https://2meet.io/2meet-data-optimizer
  * Description:       通用 WordPress 反 EAV 引擎：將 postmeta / usermeta / termmeta / commentmeta 自動分流至四象限扁平表（Hot / Warm / Cold / Archive），大幅提升搜尋與篩選效能。從 wp-data-optimizer v2.16.0 提煉的純核心，整合層交給 11 個 AddOn。
- * Version:           1.1.0
+ * Version:           1.1.1
  * Requires at least: 6.0
  * Tested up to:      6.9.4
  * Requires PHP:      8.1
@@ -26,7 +26,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 }
 
 // ── Constants ──────────────────────────────────────────────────────────────
-define( 'TMDO_VERSION', '1.1.0' );
+define( 'TMDO_VERSION', '1.1.1' );
 define( 'TMDO_DB_VERSION', '2.1.0' );
 define( 'TMDO_PATH', plugin_dir_path( __FILE__ ) );
 define( 'TMDO_URL', plugin_dir_url( __FILE__ ) );
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 227350e..472e8d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,28 @@ Versioning follows [Semantic Versioning](https://semver.org/).
 
 ---
 
+## [1.1.1] — 2026-09-26 — Security：公開 REST 不再回傳私有欄位
+
+**性質**：安全修正（Critical）。1.0.x 起即存在；1.1.0 zip 已撤回（`dist/withdrawn/`）。
+
+### Security
+
+- **公開的 `GET /wpdo/v1/listings`、`/wpdo/v1/listings/{id}` 會把所有已註冊的 hot / cold
+  欄位回傳給未登入者**：`TMDO_Schema_Registry::register()` 的 `show_in_rest` 預設為 true，
+  而 addon 都沒有設定它。dev36 實測可取得 infocards 的 `tmeetic_ig_access_token_enc`、
+  `tmeetic_ig_token_expiry`、`tmeetic_ig_user_id`，以及 WooCommerce 的 `_purchase_note`。
+  - `show_in_rest` 預設改為 **false**：要公開的欄位必須明確宣告。
+  - 受保護的 meta key（底線開頭）與名稱像憑證的 key（token、secret、password、api key、
+    private key、credential、salt、nonce）即使宣告公開也一律不輸出
+    （`TMDO_Schema_Registry::rest_exposable()`）。
+  - Zone A 列表路徑在沒有任何公開欄位時不再回傳整列（fail-closed）；篩選參數與 orderby
+    只接受公開欄位，避免藉由篩選 / 排序推測隱藏值。
+- **相容性**：依賴預設公開的欄位，現在需在註冊時加上 `'show_in_rest' => true`，或使用
+  既有的 `tmdo_rest_listing_visible_fields` filter。
+- 測試：`RestApiTest` 新增 3 個；live suite `rest`（未登入 GET 不得出現私有 / 憑證類 key）。
+
+---
+
 ## [1.1.0] — 2026-09-26 — HivePress / WooCommerce 搜尋索引模式（hardening 2.1）
 
 **性質**：資料正確性修正 + 查詢改寫補強。無 schema 變更。決策與設計見
diff --git a/includes/class-tmdo-rest-api.php b/includes/class-tmdo-rest-api.php
index 0f0735d..bdd554c 100644
--- a/includes/class-tmdo-rest-api.php
+++ b/includes/class-tmdo-rest-api.php
@@ -1396,8 +1396,13 @@ class TMDO_REST_API {
 	): WP_REST_Response {
 		global $wpdb;
 
+		// Filters and ordering only on public columns: hidden values must not be
+		// inferable by filtering or sorting on them.
 		$table   = TMDO_Zone_Hot::table( $post_type );
-		$columns = TMDO_Schema_Registry::instance()->get_hot_columns( $post_type );
+		$columns = array_intersect_key(
+			TMDO_Schema_Registry::instance()->get_hot_columns( $post_type ),
+			array_flip( TMDO_Schema_Registry::instance()->get_rest_visible_hot_columns( $post_type ) )
+		);
 
 		// Build WHERE clauses from numeric filter params.
 		$where  = array();
@@ -1443,8 +1448,8 @@ class TMDO_REST_API {
 					'post_type' => $post_type,
 				);
 				unset( $row['post_id'], $row['updated_at'] );
-				// Keep only columns with show_in_rest => true (or all if no registry entry).
-				$row = $visible_cols ? array_intersect_key( $row, $visible_cols ) : $row;
+				// Keep only public columns (none when nothing is declared public).
+				$row = array_intersect_key( $row, $visible_cols );
 				return array_merge( $item, $row );
 			},
 			$rows
diff --git a/includes/class-tmdo-schema-registry.php b/includes/class-tmdo-schema-registry.php
index 93b390c..442af5d 100644
--- a/includes/class-tmdo-schema-registry.php
+++ b/includes/class-tmdo-schema-registry.php
@@ -103,7 +103,9 @@ class TMDO_Schema_Registry {
 	 *   - ttl        (int)    TTL in seconds (Zone B only, null = no expiry).
 	 *   - cache_group (string) Object cache group (Zone C only).
 	 *   - cache_ttl   (int)   Cache TTL in seconds (Zone C only).
-	 *   - show_in_rest (bool) Whether to expose via GET /wpdo/v1/listings. Default true.
+	 *   - show_in_rest (bool) Whether to expose via the public GET /wpdo/v1/listings
+	 *                         endpoints. Default false; protected (underscore) keys and
+	 *                         credential-like keys are never exposed (see rest_exposable()).
 	 */
 	public function register( string $provider, array $config ): void {
 		$config = wp_parse_args(
@@ -120,7 +122,7 @@ class TMDO_Schema_Registry {
 				'cache_group'  => '',
 				'cache_ttl'    => HOUR_IN_SECONDS,
 				'provider'     => $provider,
-				'show_in_rest' => true,
+				'show_in_rest' => false,
 			)
 		);
 
@@ -276,6 +278,22 @@ class TMDO_Schema_Registry {
 		return array_unique( $this->cold_fields[ $post_type ] ?? array() );
 	}
 
+	/**
+	 * Whether a field may appear in the public listings endpoints: declared
+	 * show_in_rest, not a protected meta key (leading underscore — WordPress
+	 * hides those from public output, e.g. _purchase_note), and not named like a
+	 * credential (tokens, secrets, passwords, API keys), whatever it declares.
+	 *
+	 * @param array<string, mixed> $field Registered field.
+	 * @return bool
+	 */
+	private static function rest_exposable( array $field ): bool {
+		$key = (string) ( $field['meta_key'] ?? '' );
+		return ! empty( $field['show_in_rest'] )
+			&& 0 !== strpos( $key, '_' )
+			&& 1 !== preg_match( '/token|secret|passw|api_?key|private_?key|credential|salt|nonce/i', $key . ' ' . ( $field['column'] ?? '' ) );
+	}
+
 	/**
 	 * Returns hot column names for a post type where show_in_rest is true.
 	 * Used by REST endpoints to restrict publicly exposed fields.
@@ -286,7 +304,7 @@ class TMDO_Schema_Registry {
 	public function get_rest_visible_hot_columns( string $post_type ): array {
 		$visible = array();
 		foreach ( $this->fields as $field ) {
-			if ( 'hot' === $field['zone'] && $field['post_type'] === $post_type && ! empty( $field['show_in_rest'] ) ) {
+			if ( 'hot' === $field['zone'] && $field['post_type'] === $post_type && self::rest_exposable( $field ) ) {
 				$visible[] = $field['column'];
 			}
 		}
@@ -303,7 +321,7 @@ class TMDO_Schema_Registry {
 	public function get_rest_visible_cold_keys( string $post_type ): array {
 		$visible = array();
 		foreach ( $this->fields as $field ) {
-			if ( 'cold' === $field['zone'] && $field['post_type'] === $post_type && ! empty( $field['show_in_rest'] ) ) {
+			if ( 'cold' === $field['zone'] && $field['post_type'] === $post_type && self::rest_exposable( $field ) ) {
 				$visible[] = $field['meta_key'];
 			}
 		}
diff --git a/readme.txt b/readme.txt
index 2ef9863..4abaa85 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Tags: performance, database, postmeta, optimization, hivepress
 Requires at least: 6.0
 Tested up to: 6.9
 Requires PHP: 8.1
-Stable tag: 1.1.0
+Stable tag: 1.1.1
 License: GPLv2 or later
 License URI: https://www.gnu.org/licenses/gpl-2.0.html
 
@@ -107,6 +107,10 @@ The Classifier tab analyzes your existing `wp_postmeta` data (access frequency,
 
 == Changelog ==
 
+= 1.1.1 =
+* Security: the public GET /wpdo/v1/listings endpoints returned every registered field (show_in_rest defaulted to true), including private values such as integration tokens and WooCommerce purchase notes. Fields are now private unless registered with show_in_rest => true, and protected (underscore) or credential-like keys are never exposed
+* Security: the listings endpoint no longer returns whole rows when no field is public, and only filters / sorts on public columns
+
 = 1.1.0 =
 * Search-index mode for HivePress / WooCommerce sites (docs/adr-004): native meta stays the source of truth, flat tables are its search index
 * Promotion Guard: aeav_only and cleanup are refused while HivePress or WooCommerce is active (filter `tmdo_promotion_guard_allow`)
diff --git a/tests/integration/RestApiIntegrationTest.php b/tests/integration/RestApiIntegrationTest.php
index 4580cd2..d90c1ee 100644
--- a/tests/integration/RestApiIntegrationTest.php
+++ b/tests/integration/RestApiIntegrationTest.php
@@ -33,6 +33,7 @@ class RestApiIntegrationTest extends TestCase {
 			'zone'      => 'hot',
 			'column'    => 'rp_price',
 			'type'      => 'decimal',
+			'show_in_rest' => true,
 		] );
 		$registry->register( 'integration_rest', [
 			'post_type' => 'restapi',
@@ -40,11 +41,21 @@ class RestApiIntegrationTest extends TestCase {
 			'zone'      => 'hot',
 			'column'    => 'rp_featured',
 			'type'      => 'tinyint',
+			'show_in_rest' => true,
 		] );
 		$registry->register( 'integration_rest', [
 			'post_type' => 'restapi',
 			'meta_key'  => 'rp_description',
 			'zone'      => 'cold',
+			'show_in_rest' => true,
+		] );
+		// Registered but not public (1.1.1: fields are private by default).
+		$registry->register( 'integration_rest', [
+			'post_type' => 'restapi',
+			'meta_key'  => 'rp_cost',
+			'zone'      => 'hot',
+			'column'    => 'rp_cost',
+			'type'      => 'decimal',
 		] );
 
 		// Create hot table.
@@ -53,6 +64,7 @@ class RestApiIntegrationTest extends TestCase {
 				post_id    BIGINT UNSIGNED NOT NULL,
 				rp_price   DECIMAL(10,2)   DEFAULT NULL,
 				rp_featured TINYINT(1)     DEFAULT NULL,
+				rp_cost    DECIMAL(10,2)   DEFAULT NULL,
 				updated_at DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
 				PRIMARY KEY (post_id)
 			) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"
@@ -91,7 +103,8 @@ class RestApiIntegrationTest extends TestCase {
 			$featured = $i % 2;
 			$status   = $statuses[ $i ] ?? 'publish';
 			$wpdb->query( "INSERT INTO `{$wpdb->posts}` (ID, post_type, post_status) VALUES ($i, 'restapi', '$status')" );
-			$wpdb->query( "INSERT INTO `" . self::$hot_table . "` (post_id, rp_price, rp_featured) VALUES ($i, $price, $featured)" );
+			$cost     = 1000 - $price;
+			$wpdb->query( "INSERT INTO `" . self::$hot_table . "` (post_id, rp_price, rp_featured, rp_cost) VALUES ($i, $price, $featured, $cost)" );
 		}
 		$wpdb->query( "INSERT INTO `{$wpdb->posts}` (ID, post_type, post_status) VALUES (9, 'post', 'publish')" );
 		$wpdb->query( "INSERT INTO `" . self::$hot_table . "` (post_id, rp_price, rp_featured) VALUES (9, 900, 1)" );
@@ -194,6 +207,33 @@ class RestApiIntegrationTest extends TestCase {
 		$this->assertTrue( true );
 	}
 
+	public function test_listings_never_return_a_private_column(): void {
+		$req = new WP_REST_Request( 'GET', '/wpdo/v1/listings' );
+		$req->set_param( 'post_type', 'restapi' );
+
+		foreach ( self::$api->get_listings( $req )->get_data() as $item ) {
+			$this->assertArrayNotHasKey( 'rp_cost', $item );
+		}
+	}
+
+	public function test_private_column_cannot_be_used_as_a_filter(): void {
+		$req = new WP_REST_Request( 'GET', '/wpdo/v1/listings' );
+		$req->set_param( 'post_type', 'restapi' );
+		$req->set_param( 'rp_cost_min', 800 );
+
+		$this->assertSame( '5', self::$api->get_listings( $req )->get_headers()['X-WP-Total'], 'filter on a private column is ignored' );
+	}
+
+	public function test_private_column_cannot_be_used_for_ordering(): void {
+		$req = new WP_REST_Request( 'GET', '/wpdo/v1/listings' );
+		$req->set_param( 'post_type', 'restapi' );
+		$req->set_param( 'orderby', 'rp_cost' );
+		$req->set_param( 'order', 'ASC' );
+
+		// rp_cost descends as post_id rises; ignoring it falls back to post_id ASC.
+		$this->assertSame( array( 1, 2, 3, 4, 5 ), array_column( self::$api->get_listings( $req )->get_data(), 'id' ) );
+	}
+
 	public function test_listings_filter_price_min(): void {
 		$req = new WP_REST_Request( 'GET', '/wpdo/v1/listings' );
 		$req->set_param( 'post_type', 'restapi' );
diff --git a/tests/live/README.md b/tests/live/README.md
index 3d772db..602d5e3 100644
--- a/tests/live/README.md
+++ b/tests/live/README.md
@@ -40,6 +40,7 @@ Exit code 0 when every test passed, 1 otherwise. Output per test:
 | `serialized` | array meta values are stored serialized in flat tables, never "Array" |
 | `resync` | dual_write / shadow_read: flat follows native after every write (4 entities × 2 modes: update, same value, delete, refused writes, stale flat, key rename by meta_id) |
 | `router` | a routed WP_Query returns the same ids, in order, as native (OR, several post types, untyped numeric compares, named orderby, LIKE, keys of two groups, NOT EXISTS with the status/date copy route, meta orderby: HivePress sort shape, named clause, meta_key + meta_value_num); routed SQL has no GROUP BY |
+| `rest` | anonymous GET of the public listings endpoints returns no protected or credential-like field (1.1.1) |
 | `zero_side_effect` | zone tables that were never created are never queried on save / delete |
 
 ## Tools (`tools/`)
diff --git a/tests/live/suites/rest.php b/tests/live/suites/rest.php
new file mode 100644
index 0000000..22e6e45
--- /dev/null
+++ b/tests/live/suites/rest.php
@@ -0,0 +1,76 @@
+<?php
+/**
+ * Suite: the public listings endpoints never return private fields to anonymous users.
+ *
+ * Bug (dev36, 2026-09-26, fixed in 1.1.1): GET /wpdo/v1/listings/{id} is public and
+ * returned every registered hot / cold field, because show_in_rest defaulted to true —
+ * e.g. the infocards IG token fields on hp_vendor and WooCommerce's _purchase_note.
+ *
+ * @package WP_Data_Optimizer
+ */
+
+declare(strict_types=1);
+
+/**
+ * GET a wpdo REST route as an anonymous visitor.
+ *
+ * @param string               $route  Route, e.g. /wpdo/v1/listings/12.
+ * @param array<string, mixed> $params Query parameters.
+ * @return array<int|string, mixed> Response data.
+ */
+function tmdo_live_rest_anonymous( string $route, array $params = array() ): array {
+	$user    = get_current_user_id();
+	$request = new WP_REST_Request( 'GET', $route );
+	$request->set_query_params( $params );
+	wp_set_current_user( 0 );
+	try {
+		$response = rest_do_request( $request );
+	} finally {
+		wp_set_current_user( $user );
+	}
+	tmdo_live_assert_same( 200, $response->get_status(), "GET {$route}" );
+	return (array) $response->get_data();
+}
+
+/**
+ * Keys that must never reach an anonymous visitor.
+ *
+ * @return string[]
+ */
+function tmdo_live_rest_private_keys(): array {
+	return array( 'tmeetic_ig_access_token_enc', 'tmeetic_ig_token_expiry', 'tmeetic_ig_user_id', '_purchase_note' );
+}
+
+TMDO_Live::test(
+	'GET /wpdo/v1/listings/{id} returns no private field to an anonymous visitor',
+	static function () {
+		$checked = 0;
+		foreach ( array( 'hp_vendor', 'product' ) as $post_type ) {
+			$ids = get_posts( array( 'post_type' => $post_type, 'post_status' => 'publish', 'numberposts' => 1, 'fields' => 'ids' ) );
+			if ( ! $ids ) {
+				continue;
+			}
+			$data = tmdo_live_rest_anonymous( '/wpdo/v1/listings/' . (int) $ids[0] );
+			tmdo_live_assert_same( array(), array_values( array_intersect( tmdo_live_rest_private_keys(), array_keys( $data ) ) ), "{$post_type} #{$ids[0]} private keys" );
+			tmdo_live_assert_same( array(), array_values( preg_grep( '/^_|token|secret|passw|api_?key/i', array_keys( $data ) ) ), "{$post_type} #{$ids[0]} protected / credential-like keys" );
+			++$checked;
+		}
+		if ( 0 === $checked ) {
+			throw new TMDO_Live_Skip( 'no published hp_vendor or product on this site' );
+		}
+	}
+);
+
+TMDO_Live::test(
+	'GET /wpdo/v1/listings returns no private field to an anonymous visitor',
+	static function () {
+		foreach ( array( 'hp_vendor', 'product', 'hp_listing' ) as $post_type ) {
+			if ( ! post_type_exists( $post_type ) ) {
+				continue;
+			}
+			foreach ( tmdo_live_rest_anonymous( '/wpdo/v1/listings', array( 'post_type' => $post_type, 'per_page' => 5 ) ) as $item ) {
+				tmdo_live_assert_same( array(), array_values( preg_grep( '/^_|token|secret|passw|api_?key/i', array_keys( (array) $item ) ) ), "{$post_type} list item keys" );
+			}
+		}
+	}
+);
diff --git a/tests/unit/RestApiTest.php b/tests/unit/RestApiTest.php
index d17c9cf..64d947f 100644
--- a/tests/unit/RestApiTest.php
+++ b/tests/unit/RestApiTest.php
@@ -95,11 +95,13 @@ class RestApiTest extends TestCase {
 			'zone'      => 'hot',
 			'column'    => 'hp_price',
 			'type'      => 'decimal',
+			'show_in_rest' => true,
 		] );
 		$registry->register( 'test', [
 			'post_type' => 'hp_listing',
 			'meta_key'  => 'hp_description',
 			'zone'      => 'cold',
+			'show_in_rest' => true,
 		] );
 
 		$req = new WP_REST_Request( 'GET', '/wpdo/v1/listings/42' );
@@ -115,6 +117,62 @@ class RestApiTest extends TestCase {
 		$this->assertSame( 'Test desc', $data['hp_description'] );
 	}
 
+	// ── public field exposure (1.1.1) ─────────────────────────────────────────
+
+	/**
+	 * Register fields on hp_listing #43 and GET it anonymously.
+	 *
+	 * @param array<int, array<string, mixed>> $fields Field configs (post_type added).
+	 * @param array<string, string>            $meta   Stored meta.
+	 * @return array<string, mixed> Response data.
+	 */
+	private function listing_with( array $fields, array $meta ): array {
+		$GLOBALS['_wp_post_types'][43] = 'hp_listing';
+		$GLOBALS['_wp_postmeta'][43]   = $meta;
+		foreach ( $fields as $field ) {
+			WPDO_Schema_Registry::instance()->register( 'test', $field + array( 'post_type' => 'hp_listing' ) );
+		}
+		$req = new WP_REST_Request( 'GET', '/wpdo/v1/listings/43' );
+		$req->set_param( 'id', 43 );
+		return $this->api->get_listing( $req )->get_data();
+	}
+
+	public function test_registered_fields_are_not_public_unless_declared(): void {
+		$data = $this->listing_with(
+			array(
+				array( 'meta_key' => 'hp_price', 'zone' => 'hot', 'column' => 'hp_price' ),
+				array( 'meta_key' => 'hp_notes', 'zone' => 'cold' ),
+			),
+			array( 'hp_price' => '500', 'hp_notes' => 'internal' )
+		);
+
+		$this->assertSame( array( 'id', 'post_type' ), array_keys( $data ) );
+	}
+
+	public function test_protected_and_credential_keys_stay_private_even_when_declared_public(): void {
+		$data = $this->listing_with(
+			array(
+				array( 'meta_key' => 'hp_price', 'zone' => 'hot', 'column' => 'hp_price', 'show_in_rest' => true ),
+				array( 'meta_key' => '_purchase_note', 'zone' => 'cold', 'show_in_rest' => true ),
+				array( 'meta_key' => 'tmeetic_ig_access_token_enc', 'zone' => 'cold', 'show_in_rest' => true ),
+				array( 'meta_key' => 'hp_api_key', 'zone' => 'hot', 'column' => 'hp_api_key', 'show_in_rest' => true ),
+				array( 'meta_key' => 'hp_client_secret', 'zone' => 'cold', 'show_in_rest' => true ),
+			),
+			array( 'hp_price' => '500', '_purchase_note' => 'x', 'tmeetic_ig_access_token_enc' => 'y', 'hp_api_key' => 'z', 'hp_client_secret' => 'w' )
+		);
+
+		$this->assertSame( array( 'id', 'post_type', 'hp_price' ), array_keys( $data ) );
+	}
+
+	public function test_rest_visible_columns_exclude_protected_and_credential_keys(): void {
+		$registry = WPDO_Schema_Registry::instance();
+		$registry->register( 'test', array( 'post_type' => 'hp_listing', 'meta_key' => 'hp_price', 'zone' => 'hot', 'column' => 'hp_price', 'show_in_rest' => true ) );
+		$registry->register( 'test', array( 'post_type' => 'hp_listing', 'meta_key' => '_hp_token', 'zone' => 'hot', 'column' => 'hp_token', 'show_in_rest' => true ) );
+		$registry->register( 'test', array( 'post_type' => 'hp_listing', 'meta_key' => 'hp_draft', 'zone' => 'hot', 'column' => 'hp_draft' ) );
+
+		$this->assertSame( array( 'hp_price' ), $registry->get_rest_visible_hot_columns( 'hp_listing' ) );
+	}
+
 	// ── get_stats ─────────────────────────────────────────────────────────────
 
 	public function test_get_stats_404_when_post_not_found(): void {
@@ -185,7 +243,7 @@ class RestApiTest extends TestCase {
 
 	public function test_listings_fallback_only_returns_show_in_rest_columns(): void {
 		$registry = WPDO_Schema_Registry::instance();
-		$registry->register( 'unit_rest', array( 'post_type' => 'hp_listing', 'meta_key' => 'hp_price', 'zone' => 'hot', 'column' => 'hp_price' ) );
+		$registry->register( 'unit_rest', array( 'post_type' => 'hp_listing', 'meta_key' => 'hp_price', 'zone' => 'hot', 'column' => 'hp_price', 'show_in_rest' => true ) );
 		$registry->register( 'unit_rest', array( 'post_type' => 'hp_listing', 'meta_key' => 'hp_secret', 'zone' => 'hot', 'column' => 'hp_secret', 'show_in_rest' => false ) );
 
 		$post                           = new stdClass();