From c5aec8fd23015dbeb97d182e5f564eb01ed9e778 Mon Sep 17 00:00:00 2001
From: subnix <gh@subnix.io>
Date: Thu, 21 Aug 2025 19:22:53 +0400
Subject: [PATCH] fix(validators): Disabled validation with provided formdata

---
 CHANGES.rst                       | 7 +++++++
 src/wtforms/validators.py         | 2 +-
 tests/validators/test_disabled.py | 3 +++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/CHANGES.rst b/CHANGES.rst
index f34903fc9..f8e865e6b 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,5 +1,12 @@
 .. currentmodule:: wtforms
 
+Unreleased
+-------------
+
+Unreleased
+
+- Fix :class:`~validators.Disabled` validation with provided formdata. :pr:`880`
+
 Version 3.2.1
 -------------
 
diff --git a/src/wtforms/validators.py b/src/wtforms/validators.py
index 3536963bf..aefed8093 100644
--- a/src/wtforms/validators.py
+++ b/src/wtforms/validators.py
@@ -711,7 +711,7 @@ def __init__(self):
         self.field_flags = {"disabled": True}
 
     def __call__(self, form, field):
-        if field.raw_data is not None:
+        if field.raw_data:
             raise ValidationError(
                 field.gettext("This field is disabled and cannot have a value.")
             )
diff --git a/tests/validators/test_disabled.py b/tests/validators/test_disabled.py
index aab7389f8..9b306a2c8 100644
--- a/tests/validators/test_disabled.py
+++ b/tests/validators/test_disabled.py
@@ -16,5 +16,8 @@ class F(Form):
     )
     assert form.validate()
 
+    form = F(DummyPostData())
+    assert form.validate()
+
     form = F(DummyPostData(disabled=["foobar"]))
     assert not form.validate()