diff --git a/modules/rostests/apitests/user32/CMakeLists.txt b/modules/rostests/apitests/user32/CMakeLists.txt
index 7dd1be59361..3e696def280 100644
--- a/modules/rostests/apitests/user32/CMakeLists.txt
+++ b/modules/rostests/apitests/user32/CMakeLists.txt
@@ -5,6 +5,7 @@ list(APPEND SOURCE
     ../include/msgtrace.c
     CharFuncs.c
     CloseWindow.c
+    CopyImage.c
     CreateDialog.c
     CreateIconFromResourceEx.c
     CreateWindowEx.c
diff --git a/modules/rostests/apitests/user32/CopyImage.c b/modules/rostests/apitests/user32/CopyImage.c
new file mode 100644
index 00000000000..bad7c472f4f
--- /dev/null
+++ b/modules/rostests/apitests/user32/CopyImage.c
@@ -0,0 +1,84 @@
+/*
+ * PROJECT:     ReactOS API tests
+ * LICENSE:     LGPL-2.1+ (https://spdx.org/licenses/LGPL-2.1+)
+ * PURPOSE:     Test for SetFocus/GetFocus/GetGUIThreadInfo
+ * COPYRIGHT:   Copyright 2024 Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
+ */
+
+#include "precomp.h"
+#include <versionhelpers.h>
+
+#define COPYIMAGE_VALID_FLAGS ( \
+    LR_SHARED | LR_COPYFROMRESOURCE | LR_CREATEDIBSECTION | LR_LOADMAP3DCOLORS | 0x800 | \
+    LR_VGACOLOR | LR_LOADREALSIZE | LR_DEFAULTSIZE | LR_LOADTRANSPARENT | LR_LOADFROMFILE | \
+    LR_COPYDELETEORG | LR_COPYRETURNORG | LR_COLOR | LR_MONOCHROME \
+)
+
+#define LR_UNKNOWN_0x10000 0x10000
+
+static HANDLE CreateTestImage(UINT uType)
+{
+    HANDLE hImage;
+    switch (uType)
+    {
+        case IMAGE_BITMAP:
+        {
+            HDC hDC = CreateCompatibleDC(NULL);
+            hImage = (HANDLE)CreateCompatibleBitmap(hDC, 10, 10);
+            DeleteDC(hDC);
+            break;
+        }
+        case IMAGE_CURSOR:
+            hImage = (HANDLE)LoadCursor(NULL, IDC_ARROW);
+            break;
+        case IMAGE_ICON:
+            hImage = (HANDLE)LoadIcon(NULL, IDI_APPLICATION);
+            break;
+    }
+    return hImage;
+}
+
+static VOID
+Test_CopyImage_Flags(UINT uType)
+{
+    UINT iBit, uBit, uValidFlags = COPYIMAGE_VALID_FLAGS;
+    HANDLE hImage, hCopiedImage;
+
+    if (IsWindowsVistaOrGreater())
+        uValidFlags |= LR_UNKNOWN_0x10000;
+
+    hImage = CreateTestImage(uType);
+    for (iBit = 0; iBit < sizeof(UINT) * CHAR_BIT; ++iBit)
+    {
+        uBit = (1 << iBit);
+
+        SetLastError(0xDEADFACE);
+        hCopiedImage = CopyImage(hImage, uType, 0, 0, uBit);
+
+        if (uValidFlags & uBit) // Valid flag?
+        {
+            ok(hCopiedImage != NULL, "iBit %u: uType %u: hCopiedImage was NULL\n", iBit, uType);
+        }
+        else
+        {
+            ok(hCopiedImage == NULL, "iBit %u: uType %u: hCopiedImage was %p\n", iBit, uType, hCopiedImage);
+            ok_err(ERROR_INVALID_PARAMETER);
+        }
+
+        if (hCopiedImage)
+            DeleteObject(hCopiedImage);
+
+        /* If the original image was deleted, re-create it */
+        if (uBit & LR_COPYDELETEORG)
+            hImage = CreateTestImage(uType);
+    }
+
+    DeleteObject(hImage);
+}
+
+START_TEST(CopyImage)
+{
+    Test_CopyImage_Flags(IMAGE_BITMAP);
+    Test_CopyImage_Flags(IMAGE_CURSOR);
+    Test_CopyImage_Flags(IMAGE_ICON);
+}
diff --git a/modules/rostests/apitests/user32/testlist.c b/modules/rostests/apitests/user32/testlist.c
index 24e66096de1..5186c71c5d1 100644
--- a/modules/rostests/apitests/user32/testlist.c
+++ b/modules/rostests/apitests/user32/testlist.c
@@ -6,6 +6,7 @@
 extern void func_AttachThreadInput(void);
 extern void func_CharFuncs(void);
 extern void func_CloseWindow(void);
+extern void func_CopyImage(void);
 extern void func_CreateDialog(void);
 extern void func_CreateIconFromResourceEx(void);
 extern void func_CreateWindowEx(void);
@@ -67,6 +68,7 @@ const struct test winetest_testlist[] =
     { "AttachThreadInput", func_AttachThreadInput },
     { "CharFuncs", func_CharFuncs },
     { "CloseWindow", func_CloseWindow },
+    { "CopyImage", func_CopyImage },
     { "CreateDialog", func_CreateDialog },
     { "CreateIconFromResourceEx", func_CreateIconFromResourceEx },
     { "CreateWindowEx", func_CreateWindowEx },
diff --git a/win32ss/user/user32/windows/cursoricon.c b/win32ss/user/user32/windows/cursoricon.c
index 531c29abe57..586deb7a728 100644
--- a/win32ss/user/user32/windows/cursoricon.c
+++ b/win32ss/user/user32/windows/cursoricon.c
@@ -2015,6 +2015,12 @@ User32CallCopyImageFromKernel(PVOID Arguments, ULONG ArgumentLength)
 
 /************* PUBLIC FUNCTIONS *******************/
 
+#define COPYIMAGE_VALID_FLAGS ( \
+    LR_SHARED | LR_COPYFROMRESOURCE | LR_CREATEDIBSECTION | LR_LOADMAP3DCOLORS | 0x800 | \
+    LR_VGACOLOR | LR_LOADREALSIZE | LR_DEFAULTSIZE | LR_LOADTRANSPARENT | LR_LOADFROMFILE | \
+    LR_COPYDELETEORG | LR_COPYRETURNORG | LR_COLOR | LR_MONOCHROME \
+)
+
 HANDLE WINAPI CopyImage(
   _In_  HANDLE hImage,
   _In_  UINT uType,
@@ -2025,6 +2031,13 @@ HANDLE WINAPI CopyImage(
 {
     TRACE("hImage=%p, uType=%u, cxDesired=%d, cyDesired=%d, fuFlags=%x\n",
         hImage, uType, cxDesired, cyDesired, fuFlags);
+
+    if (fuFlags & ~COPYIMAGE_VALID_FLAGS)
+    {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return NULL;
+    }
+
     switch(uType)
     {
         case IMAGE_BITMAP: