diff --git a/.github/workflows/make-check.yml b/.github/workflows/make-check.yml
index 9f420fe72..f4b83d409 100644
--- a/.github/workflows/make-check.yml
+++ b/.github/workflows/make-check.yml
@@ -60,7 +60,7 @@ jobs:
             --verbose --no-interactive
             --with-develop
             --with-feature=Data::Password --with-feature=ldap
-            --with-feature=safe-unicode --with-feature=smime
+            --with-feature=smime
             --with-feature=soap --with-feature=sqlite
             ${{ startsWith(matrix.os, 'macos') && '--with-feature=macos' || '' }}
       - name: Run tests
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index af24d8a83..4a71b5ea3 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,7 +7,7 @@
     - . ~/bashrc
     - coverage-install
     - coverage-setup
-    - cpanm --quiet --notest --installdeps --with-develop --with-feature=Data::Password --with-feature=ldap --with-feature=safe-unicode --with-feature=smime --with-feature=soap --with-feature=sqlite .
+    - cpanm --quiet --notest --installdeps --with-develop --with-feature=Data::Password --with-feature=ldap --with-feature=smime --with-feature=soap --with-feature=sqlite .
     - autoreconf -i
     - ./configure
     - cd src; make; cd ..
diff --git a/.travis.yml b/.travis.yml
index 494137317..c03b076ed 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,7 +25,7 @@ before_install:
 
 install:
   - cpan-install --coverage
-  - cpanm --installdeps --notest --with-develop --with-feature=Data::Password --with-feature=ldap --with-feature=safe-unicode --with-feature=smime --with-feature=soap --with-feature=sqlite .
+  - cpanm --installdeps --notest --with-develop --with-feature=Data::Password --with-feature=ldap --with-feature=smime --with-feature=soap --with-feature=sqlite .
 
 before_script:
   - coverage-setup
diff --git a/cpanfile b/cpanfile
index a6246c39c..01959b611 100644
--- a/cpanfile
+++ b/cpanfile
@@ -150,6 +150,14 @@ requires 'Time::HiRes', '>= 1.29';
 # Used to get Unix time from local time
 requires 'Time::Local', '>= 1.23';
 
+# Normalizes file names represented by Unicode.
+# Note: Perl 5.8.1 bundles version 0.23.
+# Note: Perl 5.10.1 bundles 1.03 (per Unicode 5.1.0).
+requires 'Unicode::Normalize', '>= 1.03';
+
+# Sanitizes inputs with Unicode text.
+requires 'Unicode::UTF8', '>= 0.58';
+
 # Used to create URI containing non URI-canonical characters.
 # Note: '3.28' is the version included in URI-1.35.
 requires 'URI::Escape', '>= 3.28';
@@ -190,13 +198,6 @@ recommends 'Net::DNS', '>= 0.65';
 # This is required if you set "list_check_smtp" sympa.conf parameter, used to check existing aliases before mailing list creation.
 recommends 'Net::SMTP';
 
-# Normalizes file names represented by Unicode
-# Note: Perl 5.8.1 bundles version 0.23.
-# Note: Perl 5.10.1 bundles 1.03 (per Unicode 5.1.0).
-recommends 'Unicode::Normalize', '>= 1.03';
-
-recommends 'Unicode::UTF8', '>= 0.60';
-
 ### Features
 ##
 
@@ -324,10 +325,9 @@ feature 'soap', 'Required if you want to run the Sympa SOAP server that provides
 };
 
 feature 'safe-unicode', 'Sanitizes inputs with Unicode text.' => sub {
-    # Note: Perl 5.8.1 bundles version 0.23.
-    # Note: Perl 5.10.1 bundles 1.03 (per Unicode 5.1.0).
-    requires 'Unicode::Normalize', '>= 1.03';
-    requires 'Unicode::UTF8', '>= 0.60';
+    # Note: These became required (>=6.2.73b).
+    #requires 'Unicode::Normalize', '>= 1.03';
+    #requires 'Unicode::UTF8', '>= 0.58';
 };
 
 on 'test' => sub {
diff --git a/src/cgi/wwsympa.fcgi.in b/src/cgi/wwsympa.fcgi.in
index e99579f95..e88d9275a 100644
--- a/src/cgi/wwsympa.fcgi.in
+++ b/src/cgi/wwsympa.fcgi.in
@@ -39,6 +39,7 @@ use IO::File qw();
 use MIME::EncWords;
 use MIME::Lite::HTML;
 use POSIX qw();
+use Unicode::UTF8;
 use URI;
 use Data::Dumper;    # tentative
 
@@ -1057,6 +1058,15 @@ while ($query = Sympa::WWW::FastCGI->new) {
 
     ## Get params in a hash
     %in = $query->Vars;
+    while (my ($k, $v) = each %in) {
+        next if ref $v;
+        next if Encode::is_utf8($v);
+        unless (Unicode::UTF8::valid_utf8($v)) {
+            $log->syslog('err', 'Parameter in invalid UTF-8 %s="%s": Ignored',
+                $k, sprintf("\\x%*v02X", "\\x", $v));
+            delete $in{$k};
+        }
+    }
 
     # Determin robot.
     $robot = $ENV{SYMPA_DOMAIN};
@@ -1868,24 +1878,28 @@ sub _split_params {
     }
 
     if (@params) {
-        $in{'action'} = $params[0];
+        $in{'action'} = shift @params;
         my @args = @{$action_args{$in{'action'}} // $action_args{'default'}};
 
-        my $i = 1;
         foreach my $p (@args) {
-            my $pname;
-            ## More than 1 param
+            my ($k, $v);
             if ($p =~ /^\@(\w+)$/) {
-                $pname = $1;
-                $in{$pname} = join '/', @params[$i .. $#params];
-                $in{$pname} .= '/' if $ending_slash;
-                last;
+                $k = $1;
+                $v = join '/', @params;
+                $v .= '/' if $ending_slash;
             } else {
-                $pname = $p;
-                $in{$pname} = $params[$i];
+                $k = $p;
+                $v = shift @params;
+            }
+            $in{$k} = $v;
+
+            unless (Encode::is_utf8($v) or Unicode::UTF8::valid_utf8($v)) {
+                $log->syslog('err',
+                    'Parameter in invalid UTF-8 %s="%s": Ignored',
+                    $k, sprintf("\\x%*v02X", "\\x", $v));
+                delete $in{$k};
             }
-            wwslog('debug', 'Incoming parameter: %s=%s', $pname, $in{$pname});
-            $i++;
+            last if 0 == index $p, '@';
         }
     }
 }
diff --git a/src/lib/Sympa/Tools/Text.pm b/src/lib/Sympa/Tools/Text.pm
index fc240fe32..e72b510fc 100644
--- a/src/lib/Sympa/Tools/Text.pm
+++ b/src/lib/Sympa/Tools/Text.pm
@@ -39,8 +39,8 @@ use MIME::EncWords;
 use Text::LineFold;
 use Unicode::GCString;
 use URI::Escape qw();
-BEGIN { eval 'use Unicode::Normalize qw()'; }
-BEGIN { eval 'use Unicode::UTF8 qw()'; }
+use Unicode::Normalize qw();
+use Unicode::UTF8;
 
 use Sympa::Language;
 use Sympa::Regexps;
@@ -141,15 +141,11 @@ sub canonic_text {
     my $utext;
     if (Encode::is_utf8($text)) {
         $utext = $text;
-    } elsif ($Unicode::UTF8::VERSION) {
+    } else {
         no warnings 'utf8';
         $utext = Unicode::UTF8::decode_utf8($text);
-    } else {
-        $utext = Encode::decode_utf8($text);
-    }
-    if ($Unicode::Normalize::VERSION) {
-        $utext = Unicode::Normalize::normalize('NFC', $utext);
     }
+    $utext = Unicode::Normalize::normalize('NFC', $utext);
 
     # Remove DOS linefeeds (^M) that cause problems with Outlook 98, AOL,
     # and EIMS:
@@ -313,13 +309,8 @@ sub guessed_to_utf8 {
         and length $text
         and $text =~ /[^\x00-\x7F]/;
 
-    my $utf8;
-    if ($Unicode::UTF8::VERSION) {
-        $utf8 = Unicode::UTF8::decode_utf8($text)
-            if Unicode::UTF8::valid_utf8($text);
-    } else {
-        $utf8 = eval { Encode::decode_utf8($text, Encode::FB_CROAK()) };
-    }
+    my $utf8 = Unicode::UTF8::decode_utf8($text)
+        if Unicode::UTF8::valid_utf8($text);
     unless (defined $utf8) {
         foreach my $charset (map { $_ ? @$_ : () } @legacy_charsets{@langs}) {
             $utf8 =
@@ -332,8 +323,7 @@ sub guessed_to_utf8 {
     }
 
     # Apply NFC: e.g. for modified-NFD by Mac OS X.
-    $utf8 = Unicode::Normalize::normalize('NFC', $utf8)
-        if $Unicode::Normalize::VERSION;
+    $utf8 = Unicode::Normalize::normalize('NFC', $utf8);
 
     return Encode::encode_utf8($utf8);
 }
diff --git a/t/Tools_Text.t b/t/Tools_Text.t
index ff08480fd..642a65f29 100644
--- a/t/Tools_Text.t
+++ b/t/Tools_Text.t
@@ -46,18 +46,13 @@ is $dec, $unicode_email, 'decode_filesystem_safe, Unicode';
 # ToDo: foldcase()
 # ToDo: wrap_text()
 
-SKIP: {
-    skip 'Unicode::Normalize and Unicode::UTF8 required.'
-        unless $Unicode::Normalize::VERSION and $Unicode::UTF8::VERSION;
-
-    # Noncharacters: U+D800, U+10FFE, U+110000, U+200000
-    is Sympa::Tools::Text::canonic_text(
-        "\xED\xA0\x80\n\xF4\x8F\xBF\xBE\n\xF4\x90\x80\x80\n\xF8\x88\x80\x80\x80\n"
-        ),
-        Encode::encode_utf8(
-        "\x{FFFD}\x{FFFD}\x{FFFD}\n\x{FFFD}\n\x{FFFD}\x{FFFD}\x{FFFD}\x{FFFD}\n\x{FFFD}\x{FFFD}\x{FFFD}\x{FFFD}\x{FFFD}\n"
-        ),
-        'canonic_text';
-}
+# Noncharacters: U+D800, U+10FFE, U+110000, U+200000
+is Sympa::Tools::Text::canonic_text(
+    "\xED\xA0\x80\n\xF4\x8F\xBF\xBE\n\xF4\x90\x80\x80\n\xF8\x88\x80\x80\x80\n"
+    ),
+    Encode::encode_utf8(
+    "\x{FFFD}\x{FFFD}\x{FFFD}\n\x{FFFD}\n\x{FFFD}\x{FFFD}\x{FFFD}\x{FFFD}\n\x{FFFD}\x{FFFD}\x{FFFD}\x{FFFD}\x{FFFD}\n"
+    ),
+    'canonic_text';
 
 done_testing();