diff --git a/modules/core/include/opencv2/core/mat.hpp b/modules/core/include/opencv2/core/mat.hpp
index c6cfb78f77..4e86be7196 100644
--- a/modules/core/include/opencv2/core/mat.hpp
+++ b/modules/core/include/opencv2/core/mat.hpp
@@ -2482,8 +2482,8 @@ public:
     UMat(const UMat& m, const Range* ranges);
     UMat(const UMat& m, const std::vector<Range>& ranges);
 
-    // FIXIT copyData=false is not implemented, drop this in favor of cv::Mat (OpenCV 5.0)
-    //! builds matrix from std::vector with or without copying the data
+    //! builds matrix from std::vector. The data is always copied. The copyData
+    //! parameter is deprecated and will be removed in OpenCV 5.0.
     template<typename _Tp> explicit UMat(const std::vector<_Tp>& vec, bool copyData=false);
 
     //! destructor - calls release()
diff --git a/modules/core/include/opencv2/core/mat.inl.hpp b/modules/core/include/opencv2/core/mat.inl.hpp
index 94353a0678..8f904559d9 100644
--- a/modules/core/include/opencv2/core/mat.inl.hpp
+++ b/modules/core/include/opencv2/core/mat.inl.hpp
@@ -3254,18 +3254,13 @@ const Mat_<_Tp>& operator /= (const Mat_<_Tp>& a, const MatExpr& b)
 
 template<typename _Tp> inline
 UMat::UMat(const std::vector<_Tp>& vec, bool copyData)
-: flags(+MAGIC_VAL + traits::Type<_Tp>::value + CV_MAT_CONT_FLAG), dims(2), rows((int)vec.size()),
-cols(1), allocator(0), usageFlags(USAGE_DEFAULT), u(0), offset(0), size(&rows)
+    : flags(+MAGIC_VAL + traits::Type<_Tp>::value + CV_MAT_CONT_FLAG), dims(2), rows((int)vec.size()),
+      cols(1), allocator(0), usageFlags(USAGE_DEFAULT), u(0), offset(0), size(&rows)
 {
+    CV_UNUSED(copyData); // parameter kept for backward compatibility
     if(vec.empty())
         return;
-    if( !copyData )
-    {
-        // !!!TODO!!!
-        CV_Error(Error::StsNotImplemented, "");
-    }
-    else
-        Mat((int)vec.size(), 1, traits::Type<_Tp>::value, (uchar*)&vec[0]).copyTo(*this);
+    Mat((int)vec.size(), 1, traits::Type<_Tp>::value, (uchar*)&vec[0]).copyTo(*this);
 }
 
 inline
diff --git a/modules/core/test/test_umat.cpp b/modules/core/test/test_umat.cpp
index a89972762a..34e6d2be75 100644
--- a/modules/core/test/test_umat.cpp
+++ b/modules/core/test/test_umat.cpp
@@ -919,6 +919,28 @@ TEST(Core_UMat, getUMat)
         EXPECT_EQ(0., err);
     }
 }
+#include "test_precomp.hpp"
+
+TEST(Core_UMat, construct_from_vector)
+{
+    std::vector<int> src = {1, 2, 3, 4};
+    UMat um(src); // copyData parameter is deprecated and ignored
+
+    src[0] = 100; // modify source to ensure data was copied
+
+    Mat result;
+    um.copyTo(result);
+
+    ASSERT_EQ(4, result.rows);
+    ASSERT_EQ(1, result.cols);
+    ASSERT_EQ(CV_32S, result.type());
+    EXPECT_EQ(1, result.at<int>(0));
+    EXPECT_EQ(2, result.at<int>(1));
+    EXPECT_EQ(3, result.at<int>(2));
+    EXPECT_EQ(4, result.at<int>(3));
+}
+
+
 
 TEST(UMat, Sync)
 {
@@ -1452,4 +1474,6 @@ TEST(UMat, exceptions_refcounts_issue_20594)
     umat1.u->handle = original_handle;
 }
 
+#include "test_precomp.hpp"
+
 } } // namespace opencv_test::ocl