diff --git a/src/Domain/Account/Adapters/Account.php b/src/Domain/Account/Adapters/Account.php
index 16875cced..e77927d2a 100644
--- a/src/Domain/Account/Adapters/Account.php
+++ b/src/Domain/Account/Adapters/Account.php
@@ -33,6 +33,7 @@
 use SP\Domain\Common\Providers\Link;
 use SP\Domain\Common\Services\ServiceException;
 use SP\Domain\Config\Ports\ConfigDataInterface;
+use SP\Domain\Core\Acl\AclInterface;
 use SP\Domain\Core\Acl\AclActionsInterface;
 use SP\Domain\Core\Acl\ActionNotFoundException;
 use SP\Domain\Core\Acl\ActionsInterface;
@@ -61,10 +62,11 @@ final class Account extends Adapter implements AccountAdapter
     public function __construct(
         ConfigDataInterface               $configData,
         string                            $baseUrl,
+        AclInterface                      $acl,
         private readonly CustomFieldDataService $customFieldService,
         private readonly ActionsInterface $actions
     ) {
-        parent::__construct($configData, $baseUrl);
+        parent::__construct($configData, $baseUrl, $acl);
     }
 
     /**
@@ -81,7 +83,7 @@ public function includeCustomFields(AccountEnrichedDto $accountEnrichedDto): Col
                 $accountEnrichedDto->getId(),
                 $this->customFieldService
             ),
-            new CustomField($this->configData, $this->baseUrl)
+            new CustomField($this->configData, $this->baseUrl, $this->acl)
         );
     }
 
diff --git a/src/Domain/Category/Adapters/Category.php b/src/Domain/Category/Adapters/Category.php
index 8cb51ca10..d1846ac6f 100644
--- a/src/Domain/Category/Adapters/Category.php
+++ b/src/Domain/Category/Adapters/Category.php
@@ -33,6 +33,7 @@
 use SP\Domain\Common\Providers\Link;
 use SP\Domain\Common\Services\ServiceException;
 use SP\Domain\Config\Ports\ConfigDataInterface;
+use SP\Domain\Core\Acl\AclInterface;
 use SP\Domain\Core\Acl\AclActionsInterface;
 use SP\Domain\Core\Acl\ActionNotFoundException;
 use SP\Domain\Core\Acl\ActionsInterface;
@@ -60,10 +61,11 @@ final class Category extends Adapter implements CategoryAdapter
     public function __construct(
         ConfigDataInterface                     $configData,
         string                                  $baseUrl,
+        AclInterface                      $acl,
         private readonly CustomFieldDataService $customFieldDataService,
         private readonly ActionsInterface       $actions
     ) {
-        parent::__construct($configData, $baseUrl);
+        parent::__construct($configData, $baseUrl, $acl);
     }
 
     /**
@@ -76,7 +78,7 @@ public function includeCustomFields(CategoryModel $data): Collection
     {
         return $this->collection(
             $this->getCustomFieldsForItem(AclActionsInterface::CATEGORY, $data->getId(), $this->customFieldDataService),
-            new CustomField($this->configData, $this->baseUrl)
+            new CustomField($this->configData, $this->baseUrl, $this->acl)
         );
     }
 
diff --git a/src/Domain/Client/Adapters/Client.php b/src/Domain/Client/Adapters/Client.php
index 6945dc3ce..fba80125b 100644
--- a/src/Domain/Client/Adapters/Client.php
+++ b/src/Domain/Client/Adapters/Client.php
@@ -33,6 +33,7 @@
 use SP\Domain\Common\Providers\Link;
 use SP\Domain\Common\Services\ServiceException;
 use SP\Domain\Config\Ports\ConfigDataInterface;
+use SP\Domain\Core\Acl\AclInterface;
 use SP\Domain\Core\Acl\AclActionsInterface;
 use SP\Domain\Core\Acl\ActionNotFoundException;
 use SP\Domain\Core\Acl\ActionsInterface;
@@ -60,10 +61,11 @@ final class Client extends Adapter implements ClientAdapter
     public function __construct(
         ConfigDataInterface                     $configData,
         string                                  $baseUrl,
+        AclInterface                      $acl,
         private readonly CustomFieldDataService $customFieldDataService,
         private readonly ActionsInterface       $actions
     ) {
-        parent::__construct($configData, $baseUrl);
+        parent::__construct($configData, $baseUrl, $acl);
     }
 
     /**
@@ -76,7 +78,7 @@ public function includeCustomFields(ClientModel $client): Collection
     {
         return $this->collection(
             $this->getCustomFieldsForItem(AclActionsInterface::CLIENT, $client->getId(), $this->customFieldDataService),
-            new CustomField($this->configData, $this->baseUrl)
+            new CustomField($this->configData, $this->baseUrl, $this->acl)
         );
     }
 
diff --git a/src/Domain/Common/Adapters/Adapter.php b/src/Domain/Common/Adapters/Adapter.php
index 6d16f2c1e..12c3dfd3c 100644
--- a/src/Domain/Common/Adapters/Adapter.php
+++ b/src/Domain/Common/Adapters/Adapter.php
@@ -27,6 +27,7 @@
 
 use League\Fractal\TransformerAbstract;
 use SP\Domain\Config\Ports\ConfigDataInterface;
+use SP\Domain\Core\Acl\AclInterface;
 
 /**
  * Class Adapter
@@ -35,7 +36,8 @@ abstract class Adapter extends TransformerAbstract
 {
     public function __construct(
         protected readonly ConfigDataInterface $configData,
-        protected readonly string              $baseUrl
+        protected readonly string              $baseUrl,
+        protected readonly AclInterface        $acl
     ) {
     }
 
diff --git a/src/Domain/CustomField/Adapters/CustomField.php b/src/Domain/CustomField/Adapters/CustomField.php
index 43f642029..15afdb51f 100644
--- a/src/Domain/CustomField/Adapters/CustomField.php
+++ b/src/Domain/CustomField/Adapters/CustomField.php
@@ -26,6 +26,7 @@
 namespace SP\Domain\CustomField\Adapters;
 
 use SP\Domain\Common\Adapters\Adapter;
+use SP\Domain\Core\Acl\AclActionsInterface;
 use SP\Domain\Common\Dtos\Dto;
 use SP\Domain\CustomField\Ports\CustomFieldAdapter;
 use SP\Domain\CustomField\Services\CustomFieldItem;
@@ -35,6 +36,9 @@
  */
 final class CustomField extends Adapter implements CustomFieldAdapter
 {
+    /** What the theme prints in place of a value the viewer may not see. */
+    public const MASKED = '***';
+
     /**
      * @param CustomFieldItem $data
      * @return array<string, mixed>
@@ -47,9 +51,33 @@ public function transform($data): array
             'definitionId' => $data->definitionId,
             'definitionName' => $data->definitionName,
             'help' => $data->help,
-            'value' => $data->value,
+            'value' => $this->valueFor($data),
             'encrypted' => $data->isEncrypted,
             'required' => $data->required,
         ];
     }
+
+    /**
+     * The value, or what the interface would show in its place.
+     *
+     * `ItemTrait::getCustomFieldsForItem()` decrypts a stored value whenever the row carries a
+     * key, without asking who is looking — the deciding is left to whoever renders it. The theme
+     * does decide: `aux-customfields.inc` prints `***` unless `showViewCustomPass`, which
+     * `AccountHelper` sets from the account's own view-password permission. Nothing decided here,
+     * so `account/view?customFields=1` answered with the decrypted value — on a token for
+     * `account/view`, an action the API otherwise keeps apart from `account/viewPass` precisely
+     * because one of them hands out secrets.
+     *
+     * A field that was never encrypted is not a secret and is returned as it is.
+     */
+    private function valueFor(CustomFieldItem $data): ?string
+    {
+        if (!$data->isValueEncrypted) {
+            return $data->value;
+        }
+
+        return $this->acl->checkUserAccess(AclActionsInterface::CUSTOMFIELD_VIEW_PASS)
+            ? $data->value
+            : self::MASKED;
+    }
 }
diff --git a/tests/Unit/Domain/Account/Adapters/AccountTest.php b/tests/Unit/Domain/Account/Adapters/AccountTest.php
index 805306b5a..241cc8dd5 100644
--- a/tests/Unit/Domain/Account/Adapters/AccountTest.php
+++ b/tests/Unit/Domain/Account/Adapters/AccountTest.php
@@ -30,6 +30,7 @@
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\MockObject\Exception;
 use SP\Domain\Account\Adapters\Account;
+use SP\Domain\Core\Acl\AclInterface;
 use SP\Domain\Core\Acl\AclActionsInterface;
 use SP\Domain\Core\Acl\ActionNotFoundException;
 use SP\Domain\Core\Acl\ActionsInterface;
@@ -70,6 +71,7 @@ public function testAdapt(): void
         $adapter = new Account(
             $this->config->getConfigData(),
             'testUrl',
+            $this->createStub(AclInterface::class),
             $this->createStub(CustomFieldDataService::class),
             $actions
         );
@@ -152,7 +154,7 @@ public function testIncludeCustomFields(): void
                 );
 
 
-        $adapter = new Account($this->config->getConfigData(), 'testUrl', $customFieldsService, $actions);
+        $adapter = new Account($this->config->getConfigData(), 'testUrl', $this->createStub(AclInterface::class), $customFieldsService, $actions);
 
         $fractal = new Manager();
         $fractal->parseIncludes('customFields');
diff --git a/tests/Unit/Domain/Category/Adapters/CategoryTest.php b/tests/Unit/Domain/Category/Adapters/CategoryTest.php
index 1b06e34d3..3c6b8ae8b 100644
--- a/tests/Unit/Domain/Category/Adapters/CategoryTest.php
+++ b/tests/Unit/Domain/Category/Adapters/CategoryTest.php
@@ -32,6 +32,7 @@
 use PHPUnit\Framework\MockObject\Exception;
 use PHPUnit\Framework\MockObject\MockObject;
 use SP\Domain\Category\Adapters\Category;
+use SP\Domain\Core\Acl\AclInterface;
 use SP\Domain\Core\Acl\AclActionsInterface;
 use SP\Domain\Core\Acl\ActionNotFoundException;
 use SP\Domain\Core\Acl\ActionsInterface;
@@ -61,6 +62,7 @@ public function testAdapt(): void
         $adapter = new Category(
             $this->config->getConfigData(),
             'testUrl',
+            $this->createStub(AclInterface::class),
             $this->customFieldDataService,
             $this->actions
         );
@@ -93,6 +95,7 @@ public function testIncludeCustomFields(): void
         $adapter = new Category(
             $this->config->getConfigData(),
             'testUrl',
+            $this->createStub(AclInterface::class),
             $this->customFieldDataService,
             $this->actions
         );
diff --git a/tests/Unit/Domain/Client/Adapters/ClientTest.php b/tests/Unit/Domain/Client/Adapters/ClientTest.php
index 68e4c86cb..a6a94d6d4 100644
--- a/tests/Unit/Domain/Client/Adapters/ClientTest.php
+++ b/tests/Unit/Domain/Client/Adapters/ClientTest.php
@@ -32,6 +32,7 @@
 use PHPUnit\Framework\MockObject\Exception;
 use PHPUnit\Framework\MockObject\MockObject;
 use SP\Domain\Client\Adapters\Client;
+use SP\Domain\Core\Acl\AclInterface;
 use SP\Domain\Core\Acl\AclActionsInterface;
 use SP\Domain\Core\Acl\ActionNotFoundException;
 use SP\Domain\Core\Acl\ActionsInterface;
@@ -61,6 +62,7 @@ public function testAdapt(): void
         $adapter = new Client(
             $this->config->getConfigData(),
             'testUrl',
+            $this->createStub(AclInterface::class),
             $this->customFieldDataService,
             $this->actions
         );
@@ -94,6 +96,7 @@ public function testIncludeCustomFields(): void
         $adapter = new Client(
             $this->config->getConfigData(),
             'testUrl',
+            $this->createStub(AclInterface::class),
             $this->customFieldDataService,
             $this->actions
         );
diff --git a/tests/Unit/Domain/CustomField/Adapters/CustomFieldAdapterTest.php b/tests/Unit/Domain/CustomField/Adapters/CustomFieldAdapterTest.php
index 44dfb7334..7bef6c4f7 100644
--- a/tests/Unit/Domain/CustomField/Adapters/CustomFieldAdapterTest.php
+++ b/tests/Unit/Domain/CustomField/Adapters/CustomFieldAdapterTest.php
@@ -8,16 +8,85 @@
 use PHPUnit\Framework\TestCase;
 use SP\Domain\Config\Ports\ConfigDataInterface;
 use SP\Domain\CustomField\Adapters\CustomField;
+use SP\Domain\Core\Acl\AclActionsInterface;
+use SP\Domain\Core\Acl\AclInterface;
 use SP\Domain\CustomField\Services\CustomFieldItem;
 
 #[Group('unitary')]
 class CustomFieldAdapterTest extends TestCase
 {
-    private function makeAdapter(): CustomField
+    private function makeAdapter(bool $mayViewPass = true): CustomField
     {
         $configData = $this->createStub(ConfigDataInterface::class);
 
-        return new CustomField($configData, 'https://example.com');
+        $acl = $this->createStub(AclInterface::class);
+        $acl->method('checkUserAccess')->willReturnCallback(
+            static fn(int $action) => $action === AclActionsInterface::CUSTOMFIELD_VIEW_PASS ? $mayViewPass : true
+        );
+
+        return new CustomField($configData, 'https://example.com', $acl);
+    }
+
+    /**
+     * @param array<string, mixed> $overrides
+     */
+    private function makeItem(array $overrides = []): CustomFieldItem
+    {
+        return new CustomFieldItem(
+            required: $overrides['required'] ?? false,
+            showInList: false,
+            help: '',
+            definitionId: 5,
+            definitionName: 'API Key',
+            typeId: 2,
+            typeName: 'password',
+            typeText: 'Password',
+            moduleId: 10,
+            formId: 'cf_5',
+            value: $overrides['value'] ?? 'secret',
+            isEncrypted: $overrides['isEncrypted'] ?? true,
+            isValueEncrypted: $overrides['isValueEncrypted'] ?? true,
+        );
+    }
+
+    /**
+     * A stored secret is not handed to a caller who may not see it.
+     *
+     * `ItemTrait::getCustomFieldsForItem()` decrypts whenever the row carries a key, without asking
+     * who is looking — the deciding is left to whoever renders it. The theme does decide:
+     * `aux-customfields.inc` prints `***` unless `showViewCustomPass`, which `AccountHelper` sets
+     * from the account's own view-password permission. Nothing decided here, so
+     * `account/view?customFields=1` answered with the decrypted value — on a token for
+     * `account/view`, which the API otherwise keeps apart from `account/viewPass` precisely because
+     * one of them hands out secrets. The account's own password is not in this response for the
+     * same reason.
+     */
+    public function testAnEncryptedValueIsMaskedForACallerWhoMayNotViewPasswords(): void
+    {
+        $result = $this->makeAdapter(mayViewPass: false)->transform($this->makeItem());
+
+        self::assertSame(CustomField::MASKED, $result['value']);
+        self::assertTrue($result['encrypted'], 'the caller is still told the field holds a secret');
+    }
+
+    public function testAnEncryptedValueIsReturnedToACallerWhoMayViewPasswords(): void
+    {
+        $result = $this->makeAdapter(mayViewPass: true)->transform($this->makeItem());
+
+        self::assertSame('secret', $result['value']);
+    }
+
+    /**
+     * A field that was never encrypted is not a secret, and the permission does not apply to it —
+     * masking every custom field would have been a different change, and a wrong one.
+     */
+    public function testAValueThatWasNeverEncryptedIsReturnedRegardless(): void
+    {
+        $result = $this->makeAdapter(mayViewPass: false)->transform(
+            $this->makeItem(['isValueEncrypted' => false, 'isEncrypted' => false, 'value' => 'plain'])
+        );
+
+        self::assertSame('plain', $result['value']);
     }
 
     public function testTransformReturnsExpectedKeys(): void