diff --git a/news/1771.bugfix b/news/1771.bugfix
new file mode 100644
index 0000000000..55046bdae0
--- /dev/null
+++ b/news/1771.bugfix
@@ -0,0 +1 @@
+Returns an error message when an Invalid error occurs when validating a controlpanel field. Also translates the message. @wesleybl
diff --git a/src/plone/restapi/deserializer/controlpanels/__init__.py b/src/plone/restapi/deserializer/controlpanels/__init__.py
index 53b9a2a07c..f27b8fd4b8 100644
--- a/src/plone/restapi/deserializer/controlpanels/__init__.py
+++ b/src/plone/restapi/deserializer/controlpanels/__init__.py
@@ -9,7 +9,9 @@
 from zope.component import adapter
 from zope.component import getUtility
 from zope.component import queryMultiAdapter
+from zope.i18n import translate
 from zope.interface import implementer
+from zope.interface.exceptions import Invalid
 from zope.schema import getFields
 from zope.schema.interfaces import ValidationError
 
@@ -32,7 +34,7 @@ def __init__(self, controlpanel):
         self.context = self.controlpanel.context
         self.request = self.controlpanel.request
 
-    def __call__(self):
+    def __call__(self, mask_validation_errors=True):
         data = json_body(self.controlpanel.request)
 
         proxy = self.registry.forInterface(self.schema, prefix=self.schema_prefix)
@@ -61,10 +63,10 @@ def __call__(self):
                     field.validate(value)
                     # Set the value.
                     setattr(proxy, name, value)
-                except ValueError as e:
-                    errors.append({"message": str(e), "field": name, "error": e})
                 except ValidationError as e:
                     errors.append({"message": e.doc(), "field": name, "error": e})
+                except (ValueError, Invalid) as e:
+                    errors.append({"message": str(e), "field": name, "error": e})
                 else:
                     field_data[name] = value
 
@@ -77,4 +79,10 @@ def __call__(self):
                 errors.append({"error": error, "message": str(error)})
 
         if errors:
+            for error in errors:
+                if mask_validation_errors:
+                    # Drop Python specific error classes in order to be able to better handle
+                    # errors on front-end
+                    error["error"] = "ValidationError"
+                error["message"] = translate(error["message"], context=self.request)
             raise BadRequest(errors)
diff --git a/src/plone/restapi/tests/test_services_controlpanels.py b/src/plone/restapi/tests/test_services_controlpanels.py
index f23affcca5..54a63b13a1 100644
--- a/src/plone/restapi/tests/test_services_controlpanels.py
+++ b/src/plone/restapi/tests/test_services_controlpanels.py
@@ -115,6 +115,22 @@ def test_update_required(self):
         self.assertIn("message", response)
         self.assertIn("Required input is missing.", response["message"])
 
+    def test_update_validation(self):
+        response = self.api_session.patch(
+            "/@controlpanels/socialmedia", json={"twitter_username": "@test"}
+        )
+        response = response.json()
+        self.assertIn(
+            'Twitter username should not include the "@" prefix character.',
+            response["message"],
+        )
+
+    def test_update_validation_status(self):
+        response = self.api_session.patch(
+            "/@controlpanels/socialmedia", json={"twitter_username": "@test"}
+        )
+        self.assertEqual(response.status_code, 400)
+
     def test_get_usergroup_control_panel(self):
         # This control panel does not exist in Plone 5
         response = self.api_session.get("/@controlpanels/usergroup")