diff --git a/src/applications/maniphest/xaction/ManiphestTaskTitleTransaction.php b/src/applications/maniphest/xaction/ManiphestTaskTitleTransaction.php
--- a/src/applications/maniphest/xaction/ManiphestTaskTitleTransaction.php
+++ b/src/applications/maniphest/xaction/ManiphestTaskTitleTransaction.php
@@ -72,14 +72,16 @@
     // problems.
 
     foreach ($xactions as $xaction) {
-      $new = $xaction->getNewValue();
-      if (!strlen($new)) {
+      $new_value = $xaction->getNewValue();
+      $new_value = trim($new_value); // Strip surrounding whitespace
+      $xaction->setNewValue($new_value);
+      if (!strlen($new_value)) {
         $errors[] = $this->newInvalidError(
           pht('Tasks must have a title.'),
           $xaction);
         continue;
       }
-      if (mb_strlen($new) > $this->maximumTaskTitleLength) {
+      if (mb_strlen($new_value) > $this->maximumTaskTitleLength) {
         $errors[] = $this->newInvalidError(
           pht('Task title cannot exceed %d characters.',
             $this->maximumTaskTitleLength),
diff --git a/src/applications/project/xaction/PhabricatorProjectNameTransaction.php b/src/applications/project/xaction/PhabricatorProjectNameTransaction.php
--- a/src/applications/project/xaction/PhabricatorProjectNameTransaction.php
+++ b/src/applications/project/xaction/PhabricatorProjectNameTransaction.php
@@ -72,6 +72,8 @@
     $max_length = $object->getColumnMaximumByteLength('name');
     foreach ($xactions as $xaction) {
       $new_value = $xaction->getNewValue();
+      $new_value = trim($new_value); // Strip surrounding whitespace
+      $xaction->setNewValue($new_value);
       $new_length = strlen($new_value);
       if ($new_length > $max_length) {
         $errors[] = $this->newInvalidError(