Support of Ruby 2.3 removed as its life ended

app/finders/interesting_findings/emergency_pwd_reset_script.rb

@@ -14,7 +14,7 @@ module WPScan
 
           Model::EmergencyPwdResetScript.new(
             target.url(path),
-            confidence: res.body =~ /password/i ? 100 : 40,
+            confidence: /password/i.match?(res.body) ? 100 : 40,
             found_by: DIRECT_ACCESS,
             references: {
               url: 'https://codex.wordpress.org/Resetting_Your_Password#Using_the_Emergency_Password_Reset_Script'

app/finders/users/author_posts.rb

@@ -50,7 +50,7 @@ module WPScan
 
             if uri.path =~ %r{/author/([^/\b]+)/?\z}i
               usernames << [Regexp.last_match[1], 'Author Pattern', 100]
-            elsif uri.query =~ /author=[0-9]+/
+            elsif /author=[0-9]+/.match?(uri.query)
               usernames << [node.text.to_s.strip, 'Display Name', 30]
             end
           end