diff --git a/app/__init__.py b/app/__init__.py
index 448c2d811..ebdfad08d 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -145,6 +145,7 @@ def _csp(config):
         "frame-src": [
             "https://www.youtube.com",
             "https://www.youtube-nocookie.com",
+            "https://www.googletagmanager.com",
         ],
         "frame-ancestors": "'none'",
         "form-action": "'self'",
@@ -172,6 +173,12 @@ def _csp(config):
 
 
 def create_app(application):
+    @application.after_request
+    def add_csp_header(response):
+        existing_csp = response.headers.get("Content-Security-Policy", "")
+        response.headers["Content-Security-Policy"] = existing_csp + "; form-action 'self';"
+        return response
+
     @application.context_processor
     def inject_feature_flags():
         # this is where feature flags can be easily added as a dictionary within context
diff --git a/app/templates/base.html b/app/templates/base.html
index c37937cdb..f482d8f37 100644
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -14,7 +14,7 @@
     <script nonce="{{ csp_nonce() }}">document.body.className = ((document.body.className) ? document.body.className + ' js-enabled' : 'js-enabled');</script>
     {% block bodyStart %}
       {% block extra_javascripts_before_body %}
-      <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WX5NGWF"
+      <noscript><iframe sandbox src="https://www.googletagmanager.com/ns.html?id=GTM-WX5NGWF"
       height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
       {% endblock %}
     {% endblock %}
diff --git a/poetry.lock b/poetry.lock
index d1f1657be..1d0262110 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.4 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.5 and should not be changed by hand.
 
 [[package]]
 name = "ago"
diff --git a/tests/app/main/views/test_headers.py b/tests/app/main/views/test_headers.py
index 7f72838db..c84fdc094 100644
--- a/tests/app/main/views/test_headers.py
+++ b/tests/app/main/views/test_headers.py
@@ -14,7 +14,7 @@ def test_owasp_useful_headers_set(
     assert response.headers["X-Frame-Options"] == "deny"
     assert response.headers["X-Content-Type-Options"] == "nosniff"
     csp = response.headers["Content-Security-Policy"]
-    assert search(r"default-src 'self' static\.example\.com;", csp)
+    assert search(r"frame-src.*https://www\.googletagmanager\.com", csp)
     assert search(r"frame-ancestors 'none';", csp)
     assert search(r"form-action 'self';", csp)
     assert search(