diff --git a/src/applications/differential/editor/DifferentialTransactionEditor.php b/src/applications/differential/editor/DifferentialTransactionEditor.php
--- a/src/applications/differential/editor/DifferentialTransactionEditor.php
+++ b/src/applications/differential/editor/DifferentialTransactionEditor.php
@@ -1558,9 +1558,6 @@
       $object->getPHID(),
       PhabricatorObjectHasUnsubscriberEdgeType::EDGECONST);
 
-    $subscribed_phids = PhabricatorSubscribersQuery::loadSubscribersForPHID(
-      $object->getPHID());
-
     $revision = id(new DifferentialRevisionQuery())
       ->setViewer($this->getActor())
       ->withPHIDs(array($object->getPHID()))
@@ -1579,7 +1576,6 @@
     $reviewers = $revision->getReviewerStatus();
     $reviewer_phids = mpull($reviewers, 'getReviewerPHID');
 
-    $adapter->setExplicitCCs($subscribed_phids);
     $adapter->setExplicitReviewers($reviewer_phids);
     $adapter->setForbiddenCCs($unsubscribed_phids);
 
diff --git a/src/applications/herald/adapter/HeraldAdapter.php b/src/applications/herald/adapter/HeraldAdapter.php
--- a/src/applications/herald/adapter/HeraldAdapter.php
+++ b/src/applications/herald/adapter/HeraldAdapter.php
@@ -196,6 +196,20 @@
         return true;
       case self::FIELD_IS_NEW_OBJECT:
         return $this->getIsNewObject();
+      case self::FIELD_CC:
+        $object = $this->getObject();
+
+        if (!($object instanceof PhabricatorSubscribableInterface)) {
+          throw new Exception(
+            pht(
+              'Adapter object (of class "%s") does not implement interface '.
+              '"%s", so the subscribers field value can not be determined.',
+              get_class($object),
+              'PhabricatorSubscribableInterface'));
+        }
+
+        $phid = $object->getPHID();
+        return PhabricatorSubscribersQuery::loadSubscribersForPHID($phid);
       case self::FIELD_APPLICATION_EMAIL:
         $value = array();
         // while there is only one match by implementation, we do set
diff --git a/src/applications/herald/adapter/HeraldDifferentialRevisionAdapter.php b/src/applications/herald/adapter/HeraldDifferentialRevisionAdapter.php
--- a/src/applications/herald/adapter/HeraldDifferentialRevisionAdapter.php
+++ b/src/applications/herald/adapter/HeraldDifferentialRevisionAdapter.php
@@ -5,7 +5,6 @@
 
   protected $revision;
 
-  protected $explicitCCs;
   protected $explicitReviewers;
   protected $forbiddenCCs;
 
@@ -110,11 +109,6 @@
     return $object;
   }
 
-  public function setExplicitCCs($explicit_ccs) {
-    $this->explicitCCs = $explicit_ccs;
-    return $this;
-  }
-
   public function setExplicitReviewers($explicit_reviewers) {
     $this->explicitReviewers = $explicit_reviewers;
     return $this;
@@ -221,12 +215,6 @@
         return mpull($projects, 'getPHID');
       case self::FIELD_DIFF_FILE:
         return $this->loadAffectedPaths();
-      case self::FIELD_CC:
-        if (isset($this->explicitCCs)) {
-          return array_keys($this->explicitCCs);
-        } else {
-          return $this->revision->getCCPHIDs();
-        }
       case self::FIELD_REVIEWERS:
         if (isset($this->explicitReviewers)) {
           return array_keys($this->explicitReviewers);
@@ -297,19 +285,6 @@
     assert_instances_of($effects, 'HeraldEffect');
 
     $result = array();
-    if ($this->explicitCCs) {
-      $effect = new HeraldEffect();
-      $effect->setAction(self::ACTION_ADD_CC);
-      $effect->setTarget(array_keys($this->explicitCCs));
-      $effect->setReason(
-        pht(
-          'CCs provided explicitly by revision author or carried over '.
-        'from a previous version of the revision.'));
-      $result[] = new HeraldApplyTranscript(
-        $effect,
-        true,
-        pht('Added addresses to CC list.'));
-    }
 
     $forbidden_ccs = array_fill_keys(
       nonempty($this->forbiddenCCs, array()),
diff --git a/src/applications/herald/adapter/HeraldManiphestTaskAdapter.php b/src/applications/herald/adapter/HeraldManiphestTaskAdapter.php
--- a/src/applications/herald/adapter/HeraldManiphestTaskAdapter.php
+++ b/src/applications/herald/adapter/HeraldManiphestTaskAdapter.php
@@ -128,9 +128,6 @@
         return $this->getTask()->getAuthorPHID();
       case self::FIELD_ASSIGNEE:
         return $this->getTask()->getOwnerPHID();
-      case self::FIELD_CC:
-        return PhabricatorSubscribersQuery::loadSubscribersForPHID(
-          $this->getTask()->getPHID());
       case self::FIELD_PROJECTS:
         return PhabricatorEdgeQuery::loadDestinationPHIDs(
           $this->getTask()->getPHID(),
diff --git a/src/applications/herald/adapter/HeraldPholioMockAdapter.php b/src/applications/herald/adapter/HeraldPholioMockAdapter.php
--- a/src/applications/herald/adapter/HeraldPholioMockAdapter.php
+++ b/src/applications/herald/adapter/HeraldPholioMockAdapter.php
@@ -101,9 +101,6 @@
         return $this->getMock()->getDescription();
       case self::FIELD_AUTHOR:
         return $this->getMock()->getAuthorPHID();
-      case self::FIELD_CC:
-        return PhabricatorSubscribersQuery::loadSubscribersForPHID(
-          $this->getMock()->getPHID());
       case self::FIELD_PROJECTS:
         return PhabricatorEdgeQuery::loadDestinationPHIDs(
           $this->getMock()->getPHID(),
diff --git a/src/applications/phriction/herald/PhrictionDocumentHeraldAdapter.php b/src/applications/phriction/herald/PhrictionDocumentHeraldAdapter.php
--- a/src/applications/phriction/herald/PhrictionDocumentHeraldAdapter.php
+++ b/src/applications/phriction/herald/PhrictionDocumentHeraldAdapter.php
@@ -104,9 +104,6 @@
         return $this->getDocument()->getContent()->getContent();
       case self::FIELD_AUTHOR:
         return $this->getDocument()->getContent()->getAuthorPHID();
-      case self::FIELD_CC:
-        return PhabricatorSubscribersQuery::loadSubscribersForPHID(
-          $this->getDocument()->getPHID());
       case self::FIELD_PATH:
         return $this->getDocument()->getContent()->getSlug();
     }