diff --git a/lib/PostText/Controller/Thread.pm b/lib/PostText/Controller/Thread.pm
index d0cd240..8bb41b0 100644
--- a/lib/PostText/Controller/Thread.pm
+++ b/lib/PostText/Controller/Thread.pm
@@ -15,8 +15,15 @@ sub create($self) {
         $v->required('title'  )->size(1,         127);
         $v->required('body'   )->size(2, $body_limit);
         $v->optional('preview');
+        $v->csrf_protect;
 
-        if ($v->has_error) {
+        if ($v->has_error('csrf_token')) {
+            $self->stash(
+                status => 403,
+                error  => 'Something went wrong, please try again. 🥺'
+                );
+        }
+        elsif ($v->has_error) {
             $self->stash(status => 400)
         }
         else {
diff --git a/t/post.t b/t/post.t
index 2b22093..fac43b4 100644
--- a/t/post.t
+++ b/t/post.t
@@ -51,12 +51,15 @@ $t->post_ok($bump_thread_url, form => \%good_captcha)
 $t->ua->max_redirects(1);
 
 subtest 'Post new thread', sub {
+    my $csrf_token;
+
     # GET
     $t->get_ok('/human/thread/post')->status_is(200)
-        ->element_exists('form input[name="author"]' )
-        ->element_exists('form input[name="title"]'  )
-        ->element_exists('form textarea[name="body"]')
-        ->element_exists('form button[type="submit"]' )
+        ->element_exists('form input[name="author"]'    )
+        ->element_exists('form input[name="title"]'     )
+        ->element_exists('form textarea[name="body"]'   )
+        ->element_exists('form button[type="submit"]'   )
+        ->element_exists('form input[name="csrf_token"]')
         ->text_like(h2 => qr/New Thread/);
 
     # POST
@@ -64,17 +67,31 @@ subtest 'Post new thread', sub {
         ->element_exists('form input[name="author"]' )
         ->element_exists('form input[name="title"]'  )
         ->element_exists('form textarea[name="body"]')
-        ->element_exists('form button[type="submit"]' )
+        ->element_exists('form button[type="submit"]')
         ->text_like(h2 => qr/New Thread/);
 
+    # No CSRF token
+    $t->post_ok('/human/thread/post', form => \%valid_thread)
+        ->status_is(403)
+        ->text_like(p => qr/Something went wrong/);
+
+    $invalid_title{'csrf_token'} =
+        $t->tx->res->dom->at('input[name="csrf_token"]')->val;
+
     $t->post_ok('/human/thread/post', form => \%invalid_title)
         ->status_is(400)
         ->text_like(p => qr/Must be between/);
 
+    $invalid_thread{'csrf_token'} =
+        $t->tx->res->dom->at('input[name="csrf_token"]')->val;
+
     $t->post_ok('/human/thread/post', form => \%invalid_thread)
         ->status_is(400)
         ->text_like(p => qr/Must be between/);
 
+    $valid_thread{'csrf_token'} =
+        $t->tx->res->dom->at('input[name="csrf_token"]')->val;
+
     $t->post_ok('/human/thread/post', form => \%valid_thread)
         ->status_is(200)
         ->text_like(h2 => qr/Thread #\d+/);
@@ -85,22 +102,22 @@ subtest 'Post new remark', sub {
     $t->get_ok('/human/remark/post/1')->status_is(200)
         ->element_exists('form input[name="author"]' )
         ->element_exists('form textarea[name="body"]')
-        ->element_exists('form button[type="submit"]' )
+        ->element_exists('form button[type="submit"]')
         ->text_like(h2 => qr/Remark on Thread #/);
     $t->get_ok('/human/remark/post/65536')->status_is(404)
         ->text_like(p => qr/Thread not found/);
     # Test the remark-to-remark thing
     $t->get_ok('/human/remark/post/1/1')->status_is(200)
-        ->element_exists('form input[name="author"]' )
-        ->element_exists('form textarea[name="body"]')
+        ->element_exists('form input[name="author"]'  )
+        ->element_exists('form textarea[name="body"]' )
         ->element_exists('form button[type="submit"]' )
         ->element_exists('a[href$="/remark/single/1"]')
         ->text_like(h3 => qr/Last Remark/);
 
     # POST
     $t->post_ok('/human/remark/post/1')->status_is(200)
-        ->element_exists('form input[name="author"]' )
-        ->element_exists('form textarea[name="body"]')
+        ->element_exists('form input[name="author"]'  )
+        ->element_exists('form textarea[name="body"]' )
         ->element_exists('form button[type="submit"]' )
         ->text_like(h2 => qr/Remark on Thread #/);
 
diff --git a/templates/thread/create.html.ep b/templates/thread/create.html.ep
index 11a19d7..c5c2547 100644
--- a/templates/thread/create.html.ep
+++ b/templates/thread/create.html.ep
@@ -61,5 +61,6 @@
     <%= check_box preview => 1, id => 'preview' %>
     <%= label_for preview => 'Preview' %>
   </div>
+  <%= csrf_field %>
   <button type="submit" class="form-button">Post</button>
 </form>