diff --git a/lib/pretty_text.rb b/lib/pretty_text.rb
index 3814fd42a09..4ad0c96c3ca 100644
--- a/lib/pretty_text.rb
+++ b/lib/pretty_text.rb
@@ -261,11 +261,11 @@ module PrettyText
            whitelist.any?{|u| uri.host == u || uri.host.ends_with?("." << u)}
           # we are good no need for nofollow
         else
-          l["rel"] = "nofollow"
+          l["rel"] = "nofollow noopener noreferrer"
         end
       rescue URI::InvalidURIError, URI::InvalidComponentError
         # add a nofollow anyway
-        l["rel"] = "nofollow"
+        l["rel"] = "nofollow noopener noreferrer"
       end
     end
   end
diff --git a/spec/components/cooked_post_processor_spec.rb b/spec/components/cooked_post_processor_spec.rb
index 86810e5e597..8e95b49e83c 100644
--- a/spec/components/cooked_post_processor_spec.rb
+++ b/spec/components/cooked_post_processor_spec.rb
@@ -446,7 +446,7 @@ describe CookedPostProcessor do
 
     it "uses schemaless url for uploads" do
       cpp.optimize_urls
-      expect(cpp.html).to match_html '<p><a href="//test.localhost/uploads/default/2/2345678901234567.jpg">Link</a><br><img src="//test.localhost/uploads/default/1/1234567890123456.jpg"><br><a href="http://www.google.com" rel="nofollow">Google</a><br><img src="http://foo.bar/image.png"><br><a class="attachment" href="//test.localhost/uploads/default/original/1X/af2c2618032c679333bebf745e75f9088748d737.txt">text.txt</a> (20 Bytes)<br><img src="//test.localhost/images/emoji/emoji_one/smile.png?v=3" title=":smile:" class="emoji" alt=":smile:"></p>'
+      expect(cpp.html).to match_html '<p><a href="//test.localhost/uploads/default/2/2345678901234567.jpg">Link</a><br><img src="//test.localhost/uploads/default/1/1234567890123456.jpg"><br><a href="http://www.google.com" rel="nofollow noopener noreferrer">Google</a><br><img src="http://foo.bar/image.png"><br><a class="attachment" href="//test.localhost/uploads/default/original/1X/af2c2618032c679333bebf745e75f9088748d737.txt">text.txt</a> (20 Bytes)<br><img src="//test.localhost/images/emoji/emoji_one/smile.png?v=3" title=":smile:" class="emoji" alt=":smile:"></p>'
     end
 
     context "when CDN is enabled" do
@@ -454,20 +454,20 @@ describe CookedPostProcessor do
       it "does use schemaless CDN url for http uploads" do
         Rails.configuration.action_controller.stubs(:asset_host).returns("http://my.cdn.com")
         cpp.optimize_urls
-        expect(cpp.html).to match_html '<p><a href="//my.cdn.com/uploads/default/2/2345678901234567.jpg">Link</a><br><img src="//my.cdn.com/uploads/default/1/1234567890123456.jpg"><br><a href="http://www.google.com" rel="nofollow">Google</a><br><img src="http://foo.bar/image.png"><br><a class="attachment" href="//my.cdn.com/uploads/default/original/1X/af2c2618032c679333bebf745e75f9088748d737.txt">text.txt</a> (20 Bytes)<br><img src="//my.cdn.com/images/emoji/emoji_one/smile.png?v=3" title=":smile:" class="emoji" alt=":smile:"></p>'
+        expect(cpp.html).to match_html '<p><a href="//my.cdn.com/uploads/default/2/2345678901234567.jpg">Link</a><br><img src="//my.cdn.com/uploads/default/1/1234567890123456.jpg"><br><a href="http://www.google.com" rel="nofollow noopener noreferrer">Google</a><br><img src="http://foo.bar/image.png"><br><a class="attachment" href="//my.cdn.com/uploads/default/original/1X/af2c2618032c679333bebf745e75f9088748d737.txt">text.txt</a> (20 Bytes)<br><img src="//my.cdn.com/images/emoji/emoji_one/smile.png?v=3" title=":smile:" class="emoji" alt=":smile:"></p>'
       end
 
       it "does not use schemaless CDN url for https uploads" do
         Rails.configuration.action_controller.stubs(:asset_host).returns("https://my.cdn.com")
         cpp.optimize_urls
-        expect(cpp.html).to match_html '<p><a href="https://my.cdn.com/uploads/default/2/2345678901234567.jpg">Link</a><br><img src="https://my.cdn.com/uploads/default/1/1234567890123456.jpg"><br><a href="http://www.google.com" rel="nofollow">Google</a><br><img src="http://foo.bar/image.png"><br><a class="attachment" href="https://my.cdn.com/uploads/default/original/1X/af2c2618032c679333bebf745e75f9088748d737.txt">text.txt</a> (20 Bytes)<br><img src="https://my.cdn.com/images/emoji/emoji_one/smile.png?v=3" title=":smile:" class="emoji" alt=":smile:"></p>'
+        expect(cpp.html).to match_html '<p><a href="https://my.cdn.com/uploads/default/2/2345678901234567.jpg">Link</a><br><img src="https://my.cdn.com/uploads/default/1/1234567890123456.jpg"><br><a href="http://www.google.com" rel="nofollow noopener noreferrer">Google</a><br><img src="http://foo.bar/image.png"><br><a class="attachment" href="https://my.cdn.com/uploads/default/original/1X/af2c2618032c679333bebf745e75f9088748d737.txt">text.txt</a> (20 Bytes)<br><img src="https://my.cdn.com/images/emoji/emoji_one/smile.png?v=3" title=":smile:" class="emoji" alt=":smile:"></p>'
       end
 
       it "does not use CDN when login is required" do
         SiteSetting.login_required = true
         Rails.configuration.action_controller.stubs(:asset_host).returns("http://my.cdn.com")
         cpp.optimize_urls
-        expect(cpp.html).to match_html '<p><a href="//my.cdn.com/uploads/default/2/2345678901234567.jpg">Link</a><br><img src="//my.cdn.com/uploads/default/1/1234567890123456.jpg"><br><a href="http://www.google.com" rel="nofollow">Google</a><br><img src="http://foo.bar/image.png"><br><a class="attachment" href="//test.localhost/uploads/default/original/1X/af2c2618032c679333bebf745e75f9088748d737.txt">text.txt</a> (20 Bytes)<br><img src="//my.cdn.com/images/emoji/emoji_one/smile.png?v=3" title=":smile:" class="emoji" alt=":smile:"></p>'
+        expect(cpp.html).to match_html '<p><a href="//my.cdn.com/uploads/default/2/2345678901234567.jpg">Link</a><br><img src="//my.cdn.com/uploads/default/1/1234567890123456.jpg"><br><a href="http://www.google.com" rel="nofollow noopener noreferrer">Google</a><br><img src="http://foo.bar/image.png"><br><a class="attachment" href="//test.localhost/uploads/default/original/1X/af2c2618032c679333bebf745e75f9088748d737.txt">text.txt</a> (20 Bytes)<br><img src="//my.cdn.com/images/emoji/emoji_one/smile.png?v=3" title=":smile:" class="emoji" alt=":smile:"></p>'
       end
 
     end
diff --git a/spec/components/pretty_text_spec.rb b/spec/components/pretty_text_spec.rb
index 63577b90e9c..0105e0ae043 100644
--- a/spec/components/pretty_text_spec.rb
+++ b/spec/components/pretty_text_spec.rb
@@ -77,7 +77,7 @@ HTML
     end
 
     it "should inject nofollow in all user provided links" do
-      expect(PrettyText.cook('<a href="http://cnn.com">cnn</a>')).to match(/nofollow/)
+      expect(PrettyText.cook('<a href="http://cnn.com">cnn</a>')).to match(/nofollow noopener noreferrer/)
     end
 
     it "should not inject nofollow in all local links" do
diff --git a/spec/models/post_analyzer_spec.rb b/spec/models/post_analyzer_spec.rb
index 6bfe2f9cb82..8b549af7178 100644
--- a/spec/models/post_analyzer_spec.rb
+++ b/spec/models/post_analyzer_spec.rb
@@ -200,7 +200,7 @@ describe PostAnalyzer do
 
     it "ignores oneboxes" do
       post_analyzer = PostAnalyzer.new("Hello @Jake\n#{url}", default_topic_id)
-      post_analyzer.stubs(:cook).returns("<p>Hello <span class=\"mention\">@Jake</span><br><a href=\"https://twitter.com/evil_trout/status/345954894420787200\" class=\"onebox\" target=\"_blank\" rel=\"nofollow\">@Finn</a></p>")
+      post_analyzer.stubs(:cook).returns("<p>Hello <span class=\"mention\">@Jake</span><br><a href=\"https://twitter.com/evil_trout/status/345954894420787200\" class=\"onebox\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">@Finn</a></p>")
       expect(post_analyzer.raw_mentions).to eq(['jake'])
     end
 
diff --git a/spec/models/post_spec.rb b/spec/models/post_spec.rb
index e70f176d4af..0ce0ce9c576 100644
--- a/spec/models/post_spec.rb
+++ b/spec/models/post_spec.rb
@@ -812,7 +812,7 @@ describe Post do
     it "should add nofollow to links in the post for trust levels below 3" do
       post.user.trust_level = 2
       post.save
-      expect(post.cooked).to match(/nofollow/)
+      expect(post.cooked).to match(/nofollow noopener noreferrer/)
     end
 
     it "when tl3_links_no_follow is false, should not add nofollow for trust level 3 and higher" do
@@ -826,7 +826,7 @@ describe Post do
       SiteSetting.stubs(:tl3_links_no_follow).returns(true)
       post.user.trust_level = 3
       post.save
-      expect(post.cooked).to match(/nofollow/)
+      expect(post.cooked).to match(/nofollow noopener noreferrer/)
     end
   end
 
diff --git a/spec/models/user_profile_spec.rb b/spec/models/user_profile_spec.rb
index 620b79e12b0..90918ffe154 100644
--- a/spec/models/user_profile_spec.rb
+++ b/spec/models/user_profile_spec.rb
@@ -121,8 +121,8 @@ describe UserProfile do
 
       it 'includes the link as nofollow if the user is not new' do
         user.user_profile.send(:cook)
-        expect(user_profile.bio_excerpt).to match_html("I love <a href='http://discourse.org' rel='nofollow'>http://discourse.org</a>")
-        expect(user_profile.bio_processed).to match_html("<p>I love <a href=\"http://discourse.org\" rel=\"nofollow\">http://discourse.org</a></p>")
+        expect(user_profile.bio_excerpt).to match_html("I love <a href='http://discourse.org' rel='nofollow noopener noreferrer'>http://discourse.org</a>")
+        expect(user_profile.bio_processed).to match_html("<p>I love <a href=\"http://discourse.org\" rel=\"nofollow noopener noreferrer\">http://discourse.org</a></p>")
       end
 
       it 'removes the link if the user is new' do
@@ -160,8 +160,8 @@ describe UserProfile do
           created_user.save
           created_user.reload
           created_user.change_trust_level!(TrustLevel[2])
-          expect(created_user.user_profile.bio_excerpt).to match_html("I love <a href='http://discourse.org' rel='nofollow'>http://discourse.org</a>")
-          expect(created_user.user_profile.bio_processed).to match_html("<p>I love <a href=\"http://discourse.org\" rel=\"nofollow\">http://discourse.org</a></p>")
+          expect(created_user.user_profile.bio_excerpt).to match_html("I love <a href='http://discourse.org' rel='nofollow noopener noreferrer'>http://discourse.org</a>")
+          expect(created_user.user_profile.bio_processed).to match_html("<p>I love <a href=\"http://discourse.org\" rel=\"nofollow noopener noreferrer\">http://discourse.org</a></p>")
         end
       end
 
@@ -171,8 +171,8 @@ describe UserProfile do
         it 'includes the link with nofollow if the user is trust level 3 or higher' do
           user.trust_level = TrustLevel[3]
           user_profile.send(:cook)
-          expect(user_profile.bio_excerpt).to match_html("I love <a href='http://discourse.org' rel='nofollow'>http://discourse.org</a>")
-          expect(user_profile.bio_processed).to match_html("<p>I love <a href=\"http://discourse.org\" rel=\"nofollow\">http://discourse.org</a></p>")
+          expect(user_profile.bio_excerpt).to match_html("I love <a href='http://discourse.org' rel='nofollow noopener noreferrer'>http://discourse.org</a>")
+          expect(user_profile.bio_processed).to match_html("<p>I love <a href=\"http://discourse.org\" rel=\"nofollow noopener noreferrer\">http://discourse.org</a></p>")
         end
       end
     end