diff --git a/app/display/gimpimagewindow.c b/app/display/gimpimagewindow.c
index 17e031ea7e..ebe503251f 100644
--- a/app/display/gimpimagewindow.c
+++ b/app/display/gimpimagewindow.c
@@ -1146,7 +1146,11 @@ gimp_image_window_set_aux_info (GimpSessionManaged *session_managed,
           maximized = TRUE;
 
       if (width)
+#ifndef _UCRT
         sscanf (aux->value, "%d", width);
+#else
+        sscanf_s (aux->value, "%d", width);
+#endif
 
       /* compat handling for right docks */
       if (! strcmp (aux->name, GIMP_IMAGE_WINDOW_RIGHT_DOCKS_POS))
diff --git a/app/operations/gimpcurvesconfig.c b/app/operations/gimpcurvesconfig.c
index d4953b071d..f7f419d05e 100644
--- a/app/operations/gimpcurvesconfig.c
+++ b/app/operations/gimpcurvesconfig.c
@@ -587,8 +587,13 @@ gimp_curves_config_load_cruft (GimpCurvesConfig  *config,
               return FALSE;
             }
 
+#ifndef _UCRT
           if (sscanf (x_str, "%d", &index[i][j]) != 1 ||
               sscanf (y_str, "%d", &value[i][j]) != 1)
+#else
+          if (sscanf_s (x_str, "%d", &index[i][j]) != 1 ||
+              sscanf_s (y_str, "%d", &value[i][j]) != 1)
+#endif
             {
               g_set_error_literal (error,
                                    GIMP_CONFIG_ERROR, GIMP_CONFIG_ERROR_PARSE,
diff --git a/app/plug-in/gimppluginmanager-file.c b/app/plug-in/gimppluginmanager-file.c
index f1188329fa..113f404dc1 100644
--- a/app/plug-in/gimppluginmanager-file.c
+++ b/app/plug-in/gimppluginmanager-file.c
@@ -588,7 +588,11 @@ file_convert_string (const gchar *instr,
               }
 
             *tmpptr = '\0';
+#ifndef _UCRT
             sscanf ((gchar *) tmp, "%o", &k);
+#else
+            sscanf_s ((gchar *) tmp, "%o", &k);
+#endif
             *(uout++) = k;
             break;
 
@@ -626,7 +630,12 @@ file_check_single_magic (const gchar  *offset,
   gchar         num_operator;
 
   /* Check offset */
+#ifndef _UCRT
   if (sscanf (offset, "%ld", &offs) != 1)
+#else
+  if (sscanf_s (offset, "%ld", &offs) != 1)
+#endif
+
     return FILE_MATCH_NONE;
 
   /* Check type of test */
@@ -667,11 +676,23 @@ file_check_single_magic (const gchar  *offset,
       if (g_ascii_isdigit (num_operator_ptr[1]))
         {
           if (num_operator_ptr[1] != '0')      /* decimal */
+#ifndef _UCRT
             sscanf (num_operator_ptr+1, "%lu", &num_operator_val);
+#else
+            sscanf_s (num_operator_ptr+1, "%lu", &num_operator_val);
+#endif
           else if (num_operator_ptr[2] == 'x') /* hexadecimal */
+#ifndef _UCRT
             sscanf (num_operator_ptr+3, "%lx", &num_operator_val);
+#else
+            sscanf_s (num_operator_ptr+3, "%lx", &num_operator_val);
+#endif
           else                                 /* octal */
+#ifndef _UCRT
             sscanf (num_operator_ptr+2, "%lo", &num_operator_val);
+#else
+            sscanf_s (num_operator_ptr+2, "%lo", &num_operator_val);
+#endif
 
           num_operator = *num_operator_ptr;
         }
diff --git a/app/widgets/gimpdashboard.c b/app/widgets/gimpdashboard.c
index eeca8c8372..ac7965b2e5 100644
--- a/app/widgets/gimpdashboard.c
+++ b/app/widgets/gimpdashboard.c
@@ -2589,7 +2589,11 @@ gimp_dashboard_sample_memory_used (GimpDashboard *dashboard,
 
   buffer[size] = '\0';
 
+#ifndef _UCRT
   if (sscanf (buffer, "%*u %llu %llu", &resident, &shared) != 2)
+#else
+  if (sscanf_s (buffer, "%*u %llu %llu", &resident, &shared) != 2)
+#endif
     return;
 
   variable_data->available  = TRUE;
diff --git a/app/widgets/gimpselectiondata.c b/app/widgets/gimpselectiondata.c
index dea192f2e6..c84e9b4142 100644
--- a/app/widgets/gimpselectiondata.c
+++ b/app/widgets/gimpselectiondata.c
@@ -588,8 +588,13 @@ gimp_selection_data_get_image (GtkSelectionData *selection,
       gint pid;
       gint ID;
 
+#ifndef _UCRT
       if (sscanf (str, "%i:%i", &pid, &ID) == 2 &&
           pid == gimp_get_pid ())
+#else
+      if (sscanf_s (str, "%i:%i", &pid, &ID) == 2 &&
+          pid == gimp_get_pid ())
+#endif
         {
           return gimp_image_get_by_id (gimp, ID);
         }
@@ -639,8 +644,13 @@ gimp_selection_data_get_component (GtkSelectionData *selection,
       gint ID;
       gint ch;
 
+#ifndef _UCRT
       if (sscanf (str, "%i:%i:%i", &pid, &ID, &ch) == 3 &&
           pid == gimp_get_pid ())
+#else
+      if (sscanf_s (str, "%i:%i:%i", &pid, &ID, &ch) == 3 &&
+          pid == gimp_get_pid ())
+#endif
         {
           GimpImage *image = gimp_image_get_by_id (gimp, ID);
 
@@ -688,8 +698,13 @@ gimp_selection_data_get_item (GtkSelectionData *selection,
       gint pid;
       gint ID;
 
+#ifndef _UCRT
       if (sscanf (str, "%i:%i", &pid, &ID) == 2 &&
           pid == gimp_get_pid ())
+#else
+      if (sscanf_s (str, "%i:%i", &pid, &ID) == 2 &&
+          pid == gimp_get_pid ())
+#endif
         {
           return gimp_item_get_by_id (gimp, ID);
         }
@@ -961,8 +976,13 @@ gimp_selection_data_get_object (GtkSelectionData *selection,
       gpointer object_addr;
       gint     name_offset = 0;
 
+#ifndef _UCRT
       if (sscanf (str, "%i:%p:%n", &pid, &object_addr, &name_offset) >= 2 &&
           pid == gimp_get_pid () && name_offset > 0)
+#else
+      if (sscanf_s (str, "%i:%p:%n", &pid, &object_addr, &name_offset) >= 2 &&
+          pid == gimp_get_pid () && name_offset > 0)
+#endif
         {
           const gchar *name = str + name_offset;
 
diff --git a/app/widgets/gimptextbuffer.c b/app/widgets/gimptextbuffer.c
index 06a66cbe4b..bfbeefe95b 100644
--- a/app/widgets/gimptextbuffer.c
+++ b/app/widgets/gimptextbuffer.c
@@ -1376,7 +1376,11 @@ gimp_text_buffer_name_to_tag (GimpTextBuffer *buffer,
           guint       r, g, b;
           guchar      rgb[3];
 
+#ifndef _UCRT
           sscanf (value, "#%02x%02x%02x", &r, &g, &b);
+#else
+          sscanf_s (value, "#%02x%02x%02x", &r, &g, &b);
+#endif
           rgb[0] = r;
           rgb[1] = g;
           rgb[2] = b;
diff --git a/libgimp/gimpimagecombobox.c b/libgimp/gimpimagecombobox.c
index 6e434cad7a..db189ac334 100644
--- a/libgimp/gimpimagecombobox.c
+++ b/libgimp/gimpimagecombobox.c
@@ -254,8 +254,13 @@ gimp_image_combo_box_drag_data_received (GtkWidget        *widget,
       gint pid;
       gint ID;
 
+#ifndef _UCRT
       if (sscanf (str, "%i:%i", &pid, &ID) == 2 &&
           pid == gimp_getpid ())
+#else
+      if (sscanf_s (str, "%i:%i", &pid, &ID) == 2 &&
+          pid == gimp_getpid ())
+#endif
         {
           gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (widget), ID);
         }
diff --git a/libgimp/gimpitemcombobox.c b/libgimp/gimpitemcombobox.c
index d5ccbbd1b1..fde010e0be 100644
--- a/libgimp/gimpitemcombobox.c
+++ b/libgimp/gimpitemcombobox.c
@@ -538,8 +538,13 @@ gimp_item_combo_box_drag_data_received (GtkWidget        *widget,
       gint pid;
       gint ID;
 
+#ifndef _UCRT
       if (sscanf (str, "%i:%i", &pid, &ID) == 2 &&
           pid == gimp_getpid ())
+#else
+      if (sscanf_s (str, "%i:%i", &pid, &ID) == 2 &&
+          pid == gimp_getpid ())
+#endif
         {
           gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (widget), ID);
         }
diff --git a/libgimp/gimpresourcechooser.c b/libgimp/gimpresourcechooser.c
index 6995515cff..774609963b 100644
--- a/libgimp/gimpresourcechooser.c
+++ b/libgimp/gimpresourcechooser.c
@@ -627,8 +627,13 @@ gimp_resource_select_drag_data_received (GimpResourceChooser *self,
       gpointer unused;
       gint     name_offset = 0;
 
+#ifndef _UCRT
       if (sscanf (str, "%i:%p:%n", &pid, &unused, &name_offset) >= 2 &&
           pid == gimp_getpid () && name_offset > 0)
+#else
+      if (sscanf_s (str, "%i:%p:%n", &pid, &unused, &name_offset) >= 2 &&
+          pid == gimp_getpid () && name_offset > 0)
+#endif
         {
           gchar        *name = str + name_offset;
           GimpResource *resource;
diff --git a/libgimpbase/gimpreloc.c b/libgimpbase/gimpreloc.c
index 890196230b..2029f57552 100644
--- a/libgimpbase/gimpreloc.c
+++ b/libgimpbase/gimpreloc.c
@@ -297,12 +297,20 @@ _br_find_exe_for_symbol (const void *symbol, GimpBinrelocInitError *error)
       memcpy (address_string, "0x", 2);
       memcpy (address_string + 2, start_addr, len);
       address_string[2 + len] = '\0';
+#ifndef _UCRT
       sscanf (address_string, "%p", &start_addr_p);
+#else
+      sscanf_s (address_string, "%p", &start_addr_p);
+#endif
 
       memcpy (address_string, "0x", 2);
       memcpy (address_string + 2, end_addr, len);
       address_string[2 + len] = '\0';
+#ifndef _UCRT
       sscanf (address_string, "%p", &end_addr_p);
+#else
+      sscanf_s (address_string, "%p", &end_addr_p);
+#endif
 
       if (symbol >= start_addr_p && symbol < end_addr_p)
         {
diff --git a/libgimpthumb/gimpthumbnail.c b/libgimpthumb/gimpthumbnail.c
index 44b04bb655..98b0e72017 100644
--- a/libgimpthumb/gimpthumbnail.c
+++ b/libgimpthumb/gimpthumbnail.c
@@ -800,18 +800,30 @@ gimp_thumbnail_set_info_from_pixbuf (GimpThumbnail *thumbnail,
     g_strdup (gdk_pixbuf_get_option (pixbuf, TAG_THUMB_MIMETYPE));
 
   option = gdk_pixbuf_get_option (pixbuf, TAG_THUMB_IMAGE_WIDTH);
+#ifndef _UCRT
   if (option && sscanf (option, "%d", &num) == 1)
+#else
+  if (option && sscanf_s (option, "%d", &num) == 1)
+#endif
     thumbnail->image_width = num;
 
   option = gdk_pixbuf_get_option (pixbuf, TAG_THUMB_IMAGE_HEIGHT);
+#ifndef _UCRT
   if (option && sscanf (option, "%d", &num) == 1)
+#else
+  if (option && sscanf_s (option, "%d", &num) == 1)
+#endif
     thumbnail->image_height = num;
 
   thumbnail->image_type =
     g_strdup (gdk_pixbuf_get_option (pixbuf, TAG_THUMB_GIMP_TYPE));
 
   option = gdk_pixbuf_get_option (pixbuf, TAG_THUMB_GIMP_LAYERS);
+#ifndef _UCRT
   if (option && sscanf (option, "%d", &num) == 1)
+#else
+  if (option && sscanf_s (option, "%d", &num) == 1)
+#endif
     thumbnail->image_num_layers = num;
 
   g_object_thaw_notify (G_OBJECT (thumbnail));
@@ -1066,11 +1078,19 @@ gimp_thumbnail_load_thumb (GimpThumbnail  *thumbnail,
   state = GIMP_THUMB_STATE_OLD;
 
   option = gdk_pixbuf_get_option (pixbuf, TAG_THUMB_MTIME);
+#ifndef _UCRT
   if (!option || sscanf (option, "%" G_GINT64_FORMAT, &image_mtime) != 1)
+#else
+  if (!option || sscanf_s (option, "%" G_GINT64_FORMAT, &image_mtime) != 1)
+#endif
     goto finish;
 
   option = gdk_pixbuf_get_option (pixbuf, TAG_THUMB_FILESIZE);
+#ifndef _UCRT
   if (option && sscanf (option, "%" G_GINT64_FORMAT, &image_size) != 1)
+#else
+  if (option && sscanf_s (option, "%" G_GINT64_FORMAT, &image_size) != 1)
+#endif
     goto finish;
 
   /* TAG_THUMB_FILESIZE is optional but must match if present */
@@ -1424,11 +1444,19 @@ gimp_thumbnail_has_failed (GimpThumbnail *thumbnail)
     goto finish;
 
   option = gdk_pixbuf_get_option (pixbuf, TAG_THUMB_MTIME);
+#ifndef _UCRT
   if (!option || sscanf (option, "%" G_GINT64_FORMAT, &image_mtime) != 1)
+#else
+  if (!option || sscanf_s (option, "%" G_GINT64_FORMAT, &image_mtime) != 1)
+#endif
     goto finish;
 
   option = gdk_pixbuf_get_option (pixbuf, TAG_THUMB_FILESIZE);
+#ifndef _UCRT
   if (option && sscanf (option, "%" G_GINT64_FORMAT, &image_size) != 1)
+#else
+  if (option && sscanf_s (option, "%" G_GINT64_FORMAT, &image_size) != 1)
+#endif
     goto finish;
 
   /* TAG_THUMB_FILESIZE is optional but must match if present */
diff --git a/libgimpwidgets/gimppageselector.c b/libgimpwidgets/gimppageselector.c
index bccfc1aa54..ee6935b0ad 100644
--- a/libgimpwidgets/gimppageselector.c
+++ b/libgimpwidgets/gimppageselector.c
@@ -894,10 +894,18 @@ gimp_page_selector_select_range (GimpPageSelector *selector,
               from = g_strstrip (range);
               to   = g_strstrip (dash + 1);
 
+#ifndef _UCRT
               if (sscanf (from, "%i", &page_from) != 1 && strlen (from) == 0)
+#else
+              if (sscanf_s (from, "%i", &page_from) != 1 && strlen (from) == 0)
+#endif
                 page_from = 1;
 
+#ifndef _UCRT
               if (sscanf (to, "%i", &page_to) != 1 && strlen (to) == 0)
+#else
+              if (sscanf_s (to, "%i", &page_to) != 1 && strlen (to) == 0)
+#endif
                 page_to = selector->n_pages;
 
               if (page_from > 0        &&
@@ -918,9 +926,15 @@ gimp_page_selector_select_range (GimpPageSelector *selector,
             {
               gint page_no;
 
+#ifndef _UCRT
               if (sscanf (range, "%i", &page_no) == 1 &&
                   page_no >= 1                        &&
                   page_no <= selector->n_pages)
+#else
+              if (sscanf_s (range, "%i", &page_no) == 1 &&
+                  page_no >= 1                        &&
+                  page_no <= selector->n_pages)
+#endif
                 {
                   gimp_page_selector_select_page (selector, page_no - 1);
                 }
diff --git a/plug-ins/common/curve-bend.c b/plug-ins/common/curve-bend.c
index 82a83ed23f..d7f4f56a24 100644
--- a/plug-ins/common/curve-bend.c
+++ b/plug-ins/common/curve-bend.c
@@ -829,8 +829,13 @@ p_load_pointfile (BenderDialog *cd,
 
           if (strncmp (buff, KEY_POINTS, len) == 0)
             {
+#ifndef _UCRT
               n = sscanf (&buff[len],
                           "%f %f %f %f", &fux, &fuy, &flx, &fly);
+#else
+              n = sscanf_s (&buff[len],
+                            "%f %f %f %f", &fux, &fuy, &flx, &fly);
+#endif
 
               if ((n == 4) && (pi < 17))
                 {
@@ -850,7 +855,11 @@ p_load_pointfile (BenderDialog *cd,
 
           if (strncmp (buff, KEY_VAL_Y, len) == 0)
             {
+#ifndef _UCRT
               n = sscanf (&buff[len], "%d %d", &iuy, &ily);
+#else
+              n = sscanf_s (&buff[len], "%d %d", &iuy, &ily);
+#endif
 
               if ((n == 2) && (ci < 256))
                 {
diff --git a/plug-ins/common/file-gif-export.c b/plug-ins/common/file-gif-export.c
index 53b0e5d0d1..aa619af836 100644
--- a/plug-ins/common/file-gif-export.c
+++ b/plug-ins/common/file-gif-export.c
@@ -309,7 +309,11 @@ gif_export (GimpProcedure        *procedure,
           parasite_data = (gchar *) gimp_parasite_get_data (parasite, &parasite_size);
           parasite_data = g_strndup (parasite_data, parasite_size);
 
+#ifndef _UCRT
           if (sscanf (parasite_data, "%i", &num_loops) == 1)
+#else
+          if (sscanf_s (parasite_data, "%i", &num_loops) == 1)
+#endif
             {
               gboolean loop = (num_loops == 0);
 
diff --git a/plug-ins/common/file-ps.c b/plug-ins/common/file-ps.c
index ff725945bd..0db0a72359 100644
--- a/plug-ins/common/file-ps.c
+++ b/plug-ins/common/file-ps.c
@@ -1192,7 +1192,11 @@ load_image (GFile                *file,
         {
           if ((*temp < '0') || (*temp > '9'))
             continue; /* Search next digit */
+#ifndef _UCRT
           sscanf (temp, "%d", &k);
+#else
+          sscanf_s (temp, "%d", &k);
+#endif
           if (k > max_pagenum)
             max_pagenum = k;
           while ((*temp >= '0') && (*temp <= '9'))
@@ -1814,7 +1818,11 @@ get_bbox (GFile *file,
       src += 11;
       while ((*src == ' ') || (*src == '\t') || (*src == ':')) src++;
       if (strncmp (src, "(atend)", 7) == 0) continue;
+#ifndef _UCRT
       if (sscanf (src, "%d%d%d%d", x0, y0, x1, y1) == 4)
+#else
+      if (sscanf_s (src, "%d%d%d%d", x0, y0, x1, y1) == 4)
+#endif
         retval = 0;
       break;
     }
@@ -2162,7 +2170,11 @@ read_pnmraw_type (FILE *ifp,
       if (line[0] != '#')
         break;
     }
+#ifndef _UCRT
   if (sscanf (line, "%d%d", width, height) != 2)
+#else
+  if (sscanf_s (line, "%d%d", width, height) != 2)
+#endif
     return -1;
 
   *maxval = 255;
@@ -2176,7 +2188,11 @@ read_pnmraw_type (FILE *ifp,
           if (line[0] != '#')
             break;
         }
+#ifndef _UCRT
       if (sscanf (line, "%d", maxval) != 1)
+#else
+      if (sscanf_s (line, "%d", maxval) != 1)
+#endif
         return -1;
     }
 
@@ -3745,7 +3761,12 @@ count_ps_pages (GFile *file)
       fgets (buf, sizeof (buf), psfile);
 
       if (strncmp (buf + 2, "Pages:", 6) == 0)
+#ifndef _UCRT
         sscanf (buf + strlen ("%%Pages:"), "%d", &num_pages);
+#else
+        sscanf_s (buf + strlen ("%%Pages:"), "%d", &num_pages);
+#endif
+
       else if (strncmp (buf, "showpage", 8) == 0)
         showpage_count++;
     }
diff --git a/plug-ins/common/file-xbm.c b/plug-ins/common/file-xbm.c
index 3c09e6d86a..d3a38a9fd3 100644
--- a/plug-ins/common/file-xbm.c
+++ b/plug-ins/common/file-xbm.c
@@ -382,7 +382,11 @@ xbm_export (GimpProcedure        *procedure,
           parasite_data = (gchar *) gimp_parasite_get_data (parasite, &parasite_size);
           parasite_data = g_strndup (parasite_data, parasite_size);
 
+#ifndef _UCRT
           if (sscanf (parasite_data, "%i %i", &x, &y) == 2)
+#else
+          if (sscanf_s (parasite_data, "%i %i", &x, &y) == 2)
+#endif
             {
               g_object_set (config,
                             "use-hot-spot", TRUE,
diff --git a/plug-ins/common/sample-colorize.c b/plug-ins/common/sample-colorize.c
index 658a13feba..2fd78d3aff 100644
--- a/plug-ins/common/sample-colorize.c
+++ b/plug-ins/common/sample-colorize.c
@@ -1888,7 +1888,11 @@ get_filevalues (void)
   if (fp != NULL)
     {
       fgets (buf, 999, fp);
+#ifndef _UCRT
       sscanf (buf, "%f", &g_values.tol_col_err);
+#else
+      sscanf_s (buf, "%f", &g_values.tol_col_err);
+#endif
       fclose (fp);
     }
 
diff --git a/plug-ins/common/sphere-designer.c b/plug-ins/common/sphere-designer.c
index a62bec9e8d..a54a25a81a 100644
--- a/plug-ins/common/sphere-designer.c
+++ b/plug-ins/common/sphere-designer.c
@@ -2115,7 +2115,11 @@ loadit (const gchar * fn)
       t = &s.com.texture[i];
       setdefaults (t);
 
+#ifndef _UCRT
       if (sscanf (line, fmt_str, &t->majtype, &t->type, end) != 3)
+#else
+      if (sscanf_s (line, fmt_str, &t->majtype, &t->type, end) != 3)
+#endif
         t->color1.x = g_ascii_strtod (end, &end);
       if (end && errno != ERANGE)
         t->color1.y = g_ascii_strtod (end, &end);
diff --git a/plug-ins/file-dds/ddswrite.c b/plug-ins/file-dds/ddswrite.c
index 15496c6783..0c9a9163ea 100644
--- a/plug-ins/file-dds/ddswrite.c
+++ b/plug-ins/file-dds/ddswrite.c
@@ -534,9 +534,15 @@ write_dds (GFile               *file,
                                                         &parasite_size);
       parasite_data = g_strndup (parasite_data, parasite_size);
 
+#ifndef _UCRT
       n_params = sscanf (parasite_data, "%d %d %d %d %d %d", &version,
                          &comp_format, &d3d9_format, &dxgi_format, &flags,
                          &n_mipmaps);
+#else
+      n_params = sscanf_s (parasite_data, "%d %d %d %d %d %d", &version,
+                           &comp_format, &d3d9_format, &dxgi_format, &flags,
+                           &n_mipmaps);
+#endif
       if (n_params == 6)
         {
           const gchar *config_comp_format;
diff --git a/plug-ins/file-ico/ico-export.c b/plug-ins/file-ico/ico-export.c
index 5a0f136a5f..3be9ae5f66 100644
--- a/plug-ins/file-ico/ico-export.c
+++ b/plug-ins/file-ico/ico-export.c
@@ -345,7 +345,11 @@ ico_save_dialog (GimpImage            *image,
               parasite_data = (gchar *) gimp_parasite_get_data (parasite, &parasite_size);
               parasite_data = g_strndup (parasite_data, parasite_size);
 
+#ifndef _UCRT
               if (sscanf (parasite_data, "%i %i", &x, &y) == 2)
+#else
+              if (sscanf_s (parasite_data, "%i %i", &x, &y) == 2)
+#endif
                 {
                   info->hot_spot_x[i] = x;
                   info->hot_spot_y[i] = y;
@@ -1308,7 +1312,11 @@ ani_export_image (GFile                *file,
       parasite_data = (gchar *) gimp_parasite_get_data (parasite, &parasite_size);
       parasite_data = g_strndup (parasite_data, parasite_size);
 
+#ifndef _UCRT
       if (sscanf (parasite_data, "%i", &jif_rate) == 1)
+#else
+      if (sscanf_s (parasite_data, "%i", &jif_rate) == 1)
+#endif
         {
           header->jif_rate = jif_rate;
         }
diff --git a/plug-ins/file-raw/file-another-rawtherapee.c b/plug-ins/file-raw/file-another-rawtherapee.c
index 4fa1a406e7..9e671fb05e 100644
--- a/plug-ins/file-raw/file-another-rawtherapee.c
+++ b/plug-ins/file-raw/file-another-rawtherapee.c
@@ -138,10 +138,17 @@ anotherrawtherapee_init_procedures (GimpPlugIn *plug_in)
       gint rtmajor = 0;
       gint rtminor = 0;
 
+#ifndef _UCRT
       if (sscanf (art_stdout,
                   "ART, version %d.%d",
                   &rtmajor, &rtminor) == 2 &&
           ((rtmajor == 1 && rtminor >= 20) || rtmajor >= 2))
+#else
+      if (sscanf_s (art_stdout,
+                    "ART, version %d.%d",
+                    &rtmajor, &rtminor) == 2 &&
+          ((rtmajor == 1 && rtminor >= 20) || rtmajor >= 2))
+#endif
         {
           have_art = TRUE;
         }
diff --git a/plug-ins/file-raw/file-darktable.c b/plug-ins/file-raw/file-darktable.c
index f585e9c9b6..35067db4c1 100644
--- a/plug-ins/file-raw/file-darktable.c
+++ b/plug-ins/file-raw/file-darktable.c
@@ -654,7 +654,11 @@ load_thumbnail_image (GFile   *file,
                       darktable_file = g_file_new_for_path (response[i + 1]);
                       image = gimp_file_load (GIMP_RUN_NONINTERACTIVE,
                                               darktable_file);
+#ifndef _UCRT
                       sscanf (response[i + 2], "%d %d", width, height);
+#else
+                      sscanf_s (response[i + 2], "%d %d", width, height);
+#endif
 
                       g_object_unref (darktable_file);
                       break;
@@ -690,7 +694,11 @@ load_thumbnail_image (GFile   *file,
                                                    -1,
                                                    "[dt4gimp]");
               if (start_of_size)
+#ifndef _UCRT
                 sscanf (start_of_size, "[dt4gimp] %d %d", width, height);
+#else
+                sscanf_s (start_of_size, "[dt4gimp] %d %d", width, height);
+#endif
             }
         }
     }
diff --git a/plug-ins/file-raw/file-rawtherapee.c b/plug-ins/file-raw/file-rawtherapee.c
index 0110f20197..27b265c325 100644
--- a/plug-ins/file-raw/file-rawtherapee.c
+++ b/plug-ins/file-raw/file-rawtherapee.c
@@ -138,10 +138,17 @@ rawtherapee_init_procedures (GimpPlugIn *plug_in)
       gint rtmajor = 0;
       gint rtminor = 0;
 
+#ifndef _UCRT
       if (sscanf (rawtherapee_stdout,
                   "RawTherapee, version %d.%d",
                   &rtmajor, &rtminor) == 2 &&
           ((rtmajor == 5 && rtminor >= 2) || rtmajor >= 6))
+#else
+      if (sscanf_s (rawtherapee_stdout,
+                    "RawTherapee, version %d.%d",
+                    &rtmajor, &rtminor) == 2 &&
+          ((rtmajor == 5 && rtminor >= 2) || rtmajor >= 6))
+#endif
         {
           have_rawtherapee = TRUE;
         }
diff --git a/plug-ins/gfig/gfig-dobject.c b/plug-ins/gfig/gfig-dobject.c
index c317888fe8..4a00226c27 100644
--- a/plug-ins/gfig/gfig-dobject.c
+++ b/plug-ins/gfig/gfig-dobject.c
@@ -120,7 +120,11 @@ d_load_object (gchar *desc,
 
   while (get_line (buf, MAX_LOAD_LINE, fp, 0))
     {
+#ifndef _UCRT
       if (sscanf (buf, "%d %d", &xpnt, &ypnt) != 2)
+#else
+      if (sscanf_s (buf, "%d %d", &xpnt, &ypnt) != 2)
+#endif
         {
           /* Read <EXTRA> block if there is one */
           if (!strcmp ("<EXTRA>", buf))
@@ -133,7 +137,11 @@ d_load_object (gchar *desc,
 
               get_line (buf, MAX_LOAD_LINE, fp, 0);
 
+#ifndef _UCRT
               if (sscanf (buf, "%d", &new_obj->type_data) != 1)
+#else
+              if (sscanf_s (buf, "%d", &new_obj->type_data) != 1)
+#endif
                 {
                   g_message ("Error while loading object (no type data)");
                   g_free (new_obj);
diff --git a/plug-ins/gfig/gfig.c b/plug-ins/gfig/gfig.c
index 526b1cb506..be4a982557 100644
--- a/plug-ins/gfig/gfig.c
+++ b/plug-ins/gfig/gfig.c
@@ -386,7 +386,11 @@ gfig_name_decode (gchar       *dest,
     {
       if (*src == '\\' && *(src+1) && *(src+2) && *(src+3))
         {
+#ifndef _UCRT
           sscanf (src+1, "%3o", &tmp);
+#else
+          sscanf_s (src+1, "%3o", &tmp);
+#endif
           *dest++ = tmp;
           src += 4;
         }
@@ -562,7 +566,11 @@ gfig_load (GimpGfig    *gfig,
     gfig_obj->version = g_ascii_strtod (load_buf + 9, NULL);
 
   get_line (load_buf, MAX_LOAD_LINE, fp, 0);
+#ifndef _UCRT
   sscanf (load_buf, "ObjCount: %d", &load_count);
+#else
+  sscanf_s (load_buf, "ObjCount: %d", &load_count);
+#endif
 
   if (load_options (gfig_obj, fp))
     {
diff --git a/plug-ins/gradient-flare/gradient-flare.c b/plug-ins/gradient-flare/gradient-flare.c
index e271c51f3a..ce5c2c8d61 100644
--- a/plug-ins/gradient-flare/gradient-flare.c
+++ b/plug-ins/gradient-flare/gradient-flare.c
@@ -4789,7 +4789,11 @@ gradient_name_decode (gchar       *dest,
     {
       if (*src == '\\' && *(src+1) && *(src+2) && *(src+3))
         {
+#ifndef _UCRT
           sscanf (src+1, "%3o", &tmp);
+#else
+          sscanf_s (src+1, "%3o", &tmp);
+#endif
           *dest++ = tmp;
           src += 4;
         }
diff --git a/plug-ins/metadata/metadata-editor.c b/plug-ins/metadata/metadata-editor.c
index ebbb52e331..0db6eda909 100644
--- a/plug-ins/metadata/metadata-editor.c
+++ b/plug-ins/metadata/metadata-editor.c
@@ -1673,7 +1673,11 @@ on_date_button_clicked (GtkButton *widget,
   date_text = gtk_entry_get_text (GTK_ENTRY (entry_widget));
   if (date_text && date_text[0] != '\0')
     {
+#ifndef _UCRT
       sscanf (date_text, "%u-%u-%u;", &year, &month, &day);
+#else
+      sscanf_s (date_text, "%u-%u-%u;", &year, &month, &day);
+#endif
       month--;
     }
   else
diff --git a/plug-ins/script-fu/libscriptfu/tinyscheme/scheme.c b/plug-ins/script-fu/libscriptfu/tinyscheme/scheme.c
index de26ac398d..b5046fd40f 100644
--- a/plug-ins/script-fu/libscriptfu/tinyscheme/scheme.c
+++ b/plug-ins/script-fu/libscriptfu/tinyscheme/scheme.c
@@ -1338,14 +1338,26 @@ static pointer mk_sharp_const(scheme *sc, char *name) {
           return (sc->F);
      else if (*name == 'o') {/* #o (octal) */
           snprintf(tmp, STRBUFFSIZE, "0%s", name+1);
+#ifndef _UCRT
           sscanf(tmp, "%lo", (long unsigned *)&x);
+#else
+          sscanf_s(tmp, "%lo", (long unsigned *)&x);
+#endif
           return (mk_integer(sc, x));
      } else if (*name == 'd') {    /* #d (decimal) */
+#ifndef _UCRT
           sscanf(name+1, "%ld", (long int *)&x);
+#else
+          sscanf_s(name+1, "%ld", (long int *)&x);
+#endif
           return (mk_integer(sc, x));
      } else if (*name == 'x') {    /* #x (hex) */
           snprintf(tmp, STRBUFFSIZE, "0x%s", name+1);
+#ifndef _UCRT
           sscanf(tmp, "%lx", (long unsigned *)&x);
+#else
+          sscanf_s(tmp, "%lx", (long unsigned *)&x);
+#endif
           return (mk_integer(sc, x));
      } else if (*name == 'b') {    /* #b (binary) */
           x = binary_decode(name+1);
@@ -1371,7 +1383,11 @@ static pointer mk_sharp_const(scheme *sc, char *name) {
             }
             else {
               /* #\x<[0-f]*> Convert hex literal to codepoint. */
+#ifndef _UCRT
               if(sscanf(name+2,"%x",(unsigned int *)&codepoint)!=1) {
+#else
+              if(sscanf_s(name+2,"%x",(unsigned int *)&codepoint)!=1) {
+#endif
                 g_warning ("Hex literal has invalid digits");
                 return sc->NIL;
               }