diff --git a/mailbox/delete_mail.cgi b/mailbox/delete_mail.cgi
index c2cf2420..82054407 100755
--- a/mailbox/delete_mail.cgi
+++ b/mailbox/delete_mail.cgi
@@ -10,8 +10,9 @@ our (%text, %in, %userconfig, %gconfig);
 require './mailbox-lib.pl';
 &ReadParse();
 my @ids = sort { $a <=> $b } split(/\0/, $in{'d'});
-my @folders = &list_folders();
-my $folder = $folders[$in{'folder'}];
+my @folders = &list_folders_sorted();
+my ($folder) = grep { $_->{'index'} == $in{'folder'} } @folders;
+$folder || &error($text{'view_efolder'});
 my $r = time().$$;
 
 my @delmail;
diff --git a/mailbox/detach.cgi b/mailbox/detach.cgi
index 37f9dbdc..4d4a4808 100755
--- a/mailbox/detach.cgi
+++ b/mailbox/detach.cgi
@@ -11,8 +11,9 @@ use Socket;
 require './mailbox-lib.pl';
 
 &ReadParse();
-my @folders = &list_folders();
-my $folder = $folders[$in{'folder'}];
+my @folders = &list_folders_sorted();
+my ($folder) = grep { $_->{'index'} == $in{'folder'} } @folders;
+$folder || &error($text{'view_efolder'});
 my $mail = &mailbox_get_mail($folder, $in{'id'}, 0);
 $mail || &error($text{'view_egone'});
 &parse_mail($mail);
diff --git a/mailbox/detachall.cgi b/mailbox/detachall.cgi
index 176d136b..eef45126 100755
--- a/mailbox/detachall.cgi
+++ b/mailbox/detachall.cgi
@@ -10,8 +10,9 @@ require './mailbox-lib.pl';
 &error_setup($text{'detachall_err'});
 
 &ReadParse();
-my @folders = &list_folders();
-my $folder = $folders[$in{'folder'}];
+my @folders = &list_folders_sorted();
+my ($folder) = grep { $_->{'index'} == $in{'folder'} } @folders;
+$folder || &error($text{'view_efolder'});
 my $mail = &mailbox_get_mail($folder, $in{'id'}, 0);
 $mail || &error($text{'view_egone'});
 &parse_mail($mail);
diff --git a/mailbox/search_form.cgi b/mailbox/search_form.cgi
index 1f728e9e..7cb0ed93 100755
--- a/mailbox/search_form.cgi
+++ b/mailbox/search_form.cgi
@@ -10,8 +10,9 @@ our $search_folder_id;
 
 require './mailbox-lib.pl';
 &ReadParse();
-my @folders = &list_folders_sorted();
+my @folders = &list_folders_sorted(); 
 my ($folder) = grep { $_->{'index'} == $in{'folder'} } @folders;
+$folder || &error($text{'view_efolder'});
 &set_module_index($in{'folder'});
 &ui_print_header(undef, $text{'sform_title'}, "");
 
diff --git a/mailbox/send_mail.cgi b/mailbox/send_mail.cgi
index 30a0da06..1cae5b63 100755
--- a/mailbox/send_mail.cgi
+++ b/mailbox/send_mail.cgi
@@ -19,8 +19,9 @@ foreach my $k (keys %in) {
 	$in{$k} = join("\0", @{$in{$k}}) if ($k !~ /^attach\d+/);
 	}
 &set_module_index($in{'folder'});
-my @folders = &list_folders();
-my $folder = $folders[$in{'folder'}];
+my @folders = &list_folders_sorted(); 
+my ($folder) = grep { $_->{'index'} == $in{'folder'} } @folders;
+$folder || &error($text{'view_efolder'});
 &error_setup($text{'send_err'});
 if (!$in{'subject'}) {
 	if ($userconfig{'force_subject'} eq 'error') {
diff --git a/mailbox/slideshow.cgi b/mailbox/slideshow.cgi
index d9dde6b5..0b8fa0fa 100755
--- a/mailbox/slideshow.cgi
+++ b/mailbox/slideshow.cgi
@@ -10,8 +10,9 @@ require './mailbox-lib.pl';
 
 # Get the mail
 &ReadParse();
-my @folders = &list_folders();
-my $folder = $folders[$in{'folder'}];
+my @folders = &list_folders_sorted();
+my ($folder) = grep { $_->{'index'} == $in{'folder'} } @folders;
+$folder || &error($text{'view_efolder'});
 my $mail = &mailbox_get_mail($folder, $in{'id'}, 0);
 $mail || &error($text{'view_egone'});
 &parse_mail($mail);
diff --git a/mailbox/sort.cgi b/mailbox/sort.cgi
index 20bd4afe..6c8188a3 100755
--- a/mailbox/sort.cgi
+++ b/mailbox/sort.cgi
@@ -8,8 +8,9 @@ our %in;
 
 require './mailbox-lib.pl';
 &ReadParse();
-my @folders = &list_folders();
+my @folders = &list_folders_sorted();
 my ($folder) = grep { $_->{'index'} == $in{'folder'} } @folders;
+$folder || &error($text{'view_efolder'});
 &save_sort_field($folder, $in{'field'}, $in{'dir'});
 
 #Return in JSON format if needed
diff --git a/mailbox/virtualize.cgi b/mailbox/virtualize.cgi
index 519f9a6d..ae7ceeb6 100755
--- a/mailbox/virtualize.cgi
+++ b/mailbox/virtualize.cgi
@@ -19,7 +19,9 @@ my $folder = { 'type' => 6,
 foreach my $k (keys %in) {
 	if ($k =~ /^idx_(\d+)$/) {
 		my ($idx, $fidx) = split(/\s+/, $in{$k}, 2);
-		$folder->{'members'}->[$1] = [ $folders[$fidx], $idx ];
+		my ($folder) = grep { $_->{'index'} == $fidx } @folders;
+		$folder || &error($text{'view_efolder'});
+		$folder->{'members'}->[$1] = [ $folder, $idx ];
 		}
 	}
 &save_folder($folder);