diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -409,7 +409,7 @@
     'rsrc/js/application/phortune/phortune-credit-card-form.js' => 'd12d214f',
     'rsrc/js/application/policy/behavior-policy-control.js' => '0eaa33a9',
     'rsrc/js/application/policy/behavior-policy-rule-editor.js' => '9347f172',
-    'rsrc/js/application/projects/WorkboardBoard.js' => '31766c31',
+    'rsrc/js/application/projects/WorkboardBoard.js' => '65afb173',
     'rsrc/js/application/projects/WorkboardCard.js' => '0392a5d8',
     'rsrc/js/application/projects/WorkboardCardTemplate.js' => '2a61f8d4',
     'rsrc/js/application/projects/WorkboardColumn.js' => 'c3d24e63',
@@ -737,7 +737,7 @@
     'javelin-view-renderer' => '9aae2b66',
     'javelin-view-visitor' => '308f9fe4',
     'javelin-websocket' => 'fdc13e4e',
-    'javelin-workboard-board' => '31766c31',
+    'javelin-workboard-board' => '65afb173',
     'javelin-workboard-card' => '0392a5d8',
     'javelin-workboard-card-template' => '2a61f8d4',
     'javelin-workboard-column' => 'c3d24e63',
@@ -1182,18 +1182,6 @@
       'javelin-install',
       'javelin-util',
     ),
-    '31766c31' => array(
-      'javelin-install',
-      'javelin-dom',
-      'javelin-util',
-      'javelin-stratcom',
-      'javelin-workflow',
-      'phabricator-draggable-list',
-      'javelin-workboard-column',
-      'javelin-workboard-header-template',
-      'javelin-workboard-card-template',
-      'javelin-workboard-order-template',
-    ),
     '32755edb' => array(
       'javelin-install',
       'javelin-util',
@@ -1468,6 +1456,18 @@
     '60cd9241' => array(
       'javelin-behavior',
     ),
+    '65afb173' => array(
+      'javelin-install',
+      'javelin-dom',
+      'javelin-util',
+      'javelin-stratcom',
+      'javelin-workflow',
+      'phabricator-draggable-list',
+      'javelin-workboard-column',
+      'javelin-workboard-header-template',
+      'javelin-workboard-card-template',
+      'javelin-workboard-order-template',
+    ),
     '65bb0011' => array(
       'javelin-behavior',
       'javelin-dom',
diff --git a/webroot/rsrc/js/application/projects/WorkboardBoard.js b/webroot/rsrc/js/application/projects/WorkboardBoard.js
--- a/webroot/rsrc/js/application/projects/WorkboardBoard.js
+++ b/webroot/rsrc/js/application/projects/WorkboardBoard.js
@@ -479,6 +479,17 @@
 
       data.visiblePHIDs = visible_phids.join(',');
 
+      // If the user cancels the workflow (for example, by hitting an MFA
+      // prompt that they click "Cancel" on), put the card back where it was
+      // and reset the UI state.
+      var on_revert = JX.bind(
+        this,
+        this._revertCard,
+        list,
+        item,
+        src_phid,
+        dst_phid);
+
       var onupdate = JX.bind(
         this,
         this._oncardupdate,
@@ -489,9 +500,23 @@
 
       new JX.Workflow(this.getController().getMoveURI(), data)
         .setHandler(onupdate)
+        .setCloseHandler(on_revert)
         .start();
     },
 
+    _revertCard: function(list, item, src_phid, dst_phid) {
+      JX.DOM.alterClass(item, 'drag-sending', false);
+
+      var src_column = this.getColumn(src_phid);
+      var dst_column = this.getColumn(dst_phid);
+
+      src_column.markForRedraw();
+      dst_column.markForRedraw();
+      this._redrawColumns();
+
+      list.unlock();
+    },
+
     _oncardupdate: function(list, src_phid, dst_phid, after_phid, response) {
       var src_column = this.getColumn(src_phid);
       var dst_column = this.getColumn(dst_phid);