static/frontend/vuln: open reference links in a new window

Change-Id: I6776c9de8577ed3c587b4a9dfe99435aa33b96d7
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/424176
Reviewed-by: Julie Qiu <julieqiu@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Auto-Submit: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
Run-TryBot: Jamal Carvalho <jamal@golang.org>
diff --git a/static/frontend/vuln/entry/entry.tmpl b/static/frontend/vuln/entry/entry.tmpl
index d4ae294..2510ef7 100644
--- a/static/frontend/vuln/entry/entry.tmpl
+++ b/static/frontend/vuln/entry/entry.tmpl
@@ -65,13 +65,13 @@
   {{if .References}}
     <h2>References</h2>
     <ul class="VulnEntry-referenceList">
-      {{range .References}}<li><a href="{{.URL}}">{{.URL}}</a></li>{{end}}
+      {{range .References}}<li><a href="{{.URL}}" target="_blank" rel="noopener">{{.URL}}</a></li>{{end}}
     </ul>
   {{end}}
   <h2>Feedback</h2>
   <div>
     See anything missing or incorrect?
-    <a target="_blank" href="https://github.com/golang/vulndb/issues/new?assignees=&labels=Needs+Triage%2CSuggested+Edit&template=suggest_edit.yaml&title=x%2Fvulndb%3A+suggestion+regarding+{{.ID}}&report={{.ID}}">
+    <a target="_blank" rel="noopener" href="https://github.com/golang/vulndb/issues/new?assignees=&labels=Needs+Triage%2CSuggested+Edit&template=suggest_edit.yaml&title=x%2Fvulndb%3A+suggestion+regarding+{{.ID}}&report={{.ID}}">
       Suggest an edit to this report.
     </a>
   </div>