diff --git a/Kernel/cpan-lib/HTML/Scrubber.pm b/Kernel/cpan-lib/HTML/Scrubber.pm
index 96b2538cf2..832b15ec4f 100644
--- a/Kernel/cpan-lib/HTML/Scrubber.pm
+++ b/Kernel/cpan-lib/HTML/Scrubber.pm
@@ -55,9 +55,11 @@ If you're new to perl, good luck to you.
 
 =cut
 
-use 5.008;    # enforce minimum perl version of 5.8
+use v5.10;    # enforce minimum perl version of 5.8
 use strict;
 use warnings;
+use feature qw(state);
+
 use HTML::Parser 3.47 ();
 use HTML::Entities;
 use Scalar::Util ('weaken');
@@ -471,6 +473,8 @@ sub _scrub_str {
 
     my $s = $p->{"\0_s"};
 
+    state $last_start_tag = '';
+
     # premptive handling of an event might turn off the rule based handling
     if ( $s->{_preempt} && ref $s->{_preempt} eq 'CODE' ) {
         if ( $e eq 'end' && $text eq '' && $s->{_ignore_empty_end} ) {
@@ -495,6 +499,7 @@ sub _scrub_str {
     my $outstr = '';
 
     if ( $e eq 'start' ) {
+        $last_start_tag = $t;
         if ( exists $s->{_rules}->{$t} )    # is there a specific rule
         {
             if ( ref $s->{_rules}->{$t} )    # is it complicated?(not simple;)
@@ -548,7 +553,14 @@ sub _scrub_str {
     }
     elsif ( $e eq 'text' or $e eq 'default' ) {
         $text =~ s/</&lt;/g;    #https://rt.cpan.org/Public/Ticket/Attachment/83958/10332/scrubber.patch
-        $text =~ s/>/&gt;/g;
+
+        # This is very hackish.
+        if ( $last_start_tag eq 'style' ) {
+            # do not replace '>' in style tags
+        }
+        else {
+            $text =~ s/>/&gt;/g;    # see https://rt.cpan.org/Public/Bug/Display.html?id=2991
+        }
 
         $outstr .= $text;
     }
diff --git a/scripts/test/HTMLUtils/Safety.t b/scripts/test/HTMLUtils/Safety.t
index d90b985743..453031498a 100644
--- a/scripts/test/HTMLUtils/Safety.t
+++ b/scripts/test/HTMLUtils/Safety.t
@@ -26,6 +26,7 @@ use Test2::V0;
 
 # OTOBO modules
 use Kernel::System::UnitTest::RegisterOM;    # set up $Kernel::OM
+use Kernel::System::UnitTest::Diff qw(TextEqOrDiff);
 
 # get HTMLUtils object
 my $HTMLUtilsObject = $Kernel::OM->Get('Kernel::System::HTMLUtils');
@@ -662,17 +663,17 @@ END_INPUT
         Result => {
             Output => <<'END_OUTPUT',
 <style type="    text/css">
-div &gt; span {
+div > span {
     width: 200px;
 }
 </style>
 <style type=" text/CSS ">
-div &gt; span {
+div > span {
     width: expression( FormerlyEvilJS() );
 }
 </style>
 <style type="text/css">
-div &gt; span &gt; div {
+div > span > div {
     width: 200px;
 }
 </style>
@@ -933,7 +934,7 @@ for my $Test (@TestsWithDefaultConfig) {
         else {
             ok( !$Result{Replace}, 'not replaced', );
         }
-        is( $Result{String}, $Test->{Result}->{Output}, 'output' );
+        TextEqOrDiff( $Result{String}, $Test->{Result}->{Output}, 'output' );
     };
 }
 
@@ -1166,7 +1167,7 @@ You should be able to continue reading these lessons, however.
         Line => __LINE__,
     },
     {
-        Name   => 'stype with remote background image protocol-relative URL, NoExtSrcLoad',
+        Name   => 'style with remote background image protocol-relative URL, NoExtSrcLoad',
         Input  => '<a href="localhost" style="background-image:url(//localhost:8000/css-background)">localhost</a>',
         Config => {
             NoExtSrcLoad => 1,
@@ -1334,7 +1335,7 @@ for my $Test (@TestsWithExplicitConfig) {
         else {
             ok( !$Result{Replace}, 'not replaced', );
         }
-        is( $Result{String}, $Test->{Result}->{Output}, 'output' );
+        TextEqOrDiff( $Result{String}, $Test->{Result}->{Output}, 'output' );
     };
 }
 
@@ -1461,9 +1462,10 @@ END_HTML
         String => $String,
     );
 
-    # all '>' in text elements are replaced by '&gt;'
-    my $ExpectedScrubbedString = ( $String =~ s/div > p/div &gt; p/r ) =~ s/greater: >/greater: &gt;/r;
-    is( $Result{String}, $ExpectedScrubbedString, 'greater sign encoded' );
+    # all '>' in text content, except style, are replaced by '&gt;'
+    my $ExpectedScrubbedString = $String =~ s/greater: >/greater: &gt;/r;
+
+    TextEqOrDiff( $Result{String}, $ExpectedScrubbedString, 'greater sign encoded' );
 }
 
 done_testing;