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
@@ -79,6 +79,7 @@
           $xaction);
         continue;
       }
+      $xaction->setNewValue(trim($new)); // Strip surrounding whitespace
       if (mb_strlen($new) > $this->maximumTaskTitleLength) {
         $errors[] = $this->newInvalidError(
           pht('Task title cannot exceed %d characters.',
diff --git a/src/applications/project/xaction/PhabricatorProjectNameTransaction.php b/src/applications/project/xaction/PhabricatorProjectNameTransaction.php
--- a/src/applications/project/xaction/PhabricatorProjectNameTransaction.php
+++ b/src/applications/project/xaction/PhabricatorProjectNameTransaction.php
@@ -79,6 +79,7 @@
             'Project names must not be longer than %s character(s).',
             new PhutilNumber($max_length)));
       }
+      $xaction->setNewValue(trim($new_value)); // Strip surrounding whitespace
     }
 
     if ($this->getEditor()->getIsMilestone() || !$xactions) {