diff --git a/src/octoprint/plugins/pluginmanager/templates/pluginmanager_about.jinja2 b/src/octoprint/plugins/pluginmanager/templates/pluginmanager_about.jinja2
index a3609729..36f8fd67 100644
--- a/src/octoprint/plugins/pluginmanager/templates/pluginmanager_about.jinja2
+++ b/src/octoprint/plugins/pluginmanager/templates/pluginmanager_about.jinja2
@@ -2,7 +2,7 @@
 
 <ul>
     {% for plugin in plugin_pluginmanager_thirdparty %}
-        <li><a href="{{ plugin.url }}">{{ plugin.name }}</a>: {% if plugin.license %}{{ plugin.license }}{% else %}-{% endif %}</li>
+        <li>{% if plugin.url %}<a href="{{ plugin.url }}" target="_blank" rel="noreferrer noopener">{% endif %}{{ plugin.name }}{% if plugin.url %}</a>{% endif %}: {% if plugin.license %}{{ plugin.license }}{% else %}-{% endif %}</li>
     {% endfor %}
 </ul>
 
diff --git a/src/octoprint/server/__init__.py b/src/octoprint/server/__init__.py
index 963783dd..ced52d07 100644
--- a/src/octoprint/server/__init__.py
+++ b/src/octoprint/server/__init__.py
@@ -703,9 +703,24 @@ class Server(object):
 				return "{hashs} {content}".format(hashs="#" * number, content=match.group("content"))
 			return markdown_header_regex.sub(repl, s)
 
+		html_link_regex = re.compile("<(?P<tag>a.*?)>(?P<content>.*?)</a>")
+		def externalize_links(text):
+			def repl(match):
+				tag = match.group("tag")
+				if not u"href" in tag:
+					return match.group(0)
+
+				if not u"target=" in tag and not u"rel=" in tag:
+					tag += u" target=\"_blank\" rel=\"noreferrer noopener\""
+
+				content = match.group("content")
+				return u"<{tag}>{content}</a>".format(tag=tag, content=content)
+			return html_link_regex.sub(repl, text)
+
 		app.jinja_env.filters["regex_replace"] = regex_replace
 		app.jinja_env.filters["offset_html_headers"] = offset_html_headers
 		app.jinja_env.filters["offset_markdown_headers"] = offset_markdown_headers
+		app.jinja_env.filters["externalize_links"] = externalize_links
 
 		# configure additional template folders for jinja2
 		import jinja2
diff --git a/src/octoprint/templates/dialogs/about/authors.jinja2 b/src/octoprint/templates/dialogs/about/authors.jinja2
index 42a59fe9..93e02640 100644
--- a/src/octoprint/templates/dialogs/about/authors.jinja2
+++ b/src/octoprint/templates/dialogs/about/authors.jinja2
@@ -1 +1 @@
-{% filter markdown %}{% filter offset_markdown_headers(2) %}{% include "_data/AUTHORS.md" ignore missing %}{% endfilter %}{% endfilter %}
+{% filter externalize_links %}{% filter markdown %}{% filter offset_markdown_headers(2) %}{% include "_data/AUTHORS.md" ignore missing %}{% endfilter %}{% endfilter %}{% endfilter %}
diff --git a/src/octoprint/templates/dialogs/about/changelog.jinja2 b/src/octoprint/templates/dialogs/about/changelog.jinja2
index 60c34b3a..672f2cba 100644
--- a/src/octoprint/templates/dialogs/about/changelog.jinja2
+++ b/src/octoprint/templates/dialogs/about/changelog.jinja2
@@ -1 +1 @@
-{% filter markdown %}{% filter offset_markdown_headers(2) %}{% include "_data/CHANGELOG.md" ignore missing %}{% endfilter %}{% endfilter %}
+{% filter externalize_links %}{% filter markdown %}{% filter offset_markdown_headers(2) %}{% include "_data/CHANGELOG.md" ignore missing %}{% endfilter %}{% endfilter %}{% endfilter %}
diff --git a/src/octoprint/templates/dialogs/about/license.jinja2 b/src/octoprint/templates/dialogs/about/license.jinja2
index 38848981..5ef3980c 100644
--- a/src/octoprint/templates/dialogs/about/license.jinja2
+++ b/src/octoprint/templates/dialogs/about/license.jinja2
@@ -1 +1 @@
-{% include "_data/agpl.html" %}
+{% filter externalize_links %}{% include "_data/agpl.html" %}{% endfilter %}
diff --git a/src/octoprint/templates/dialogs/about/supporters.jinja2 b/src/octoprint/templates/dialogs/about/supporters.jinja2
index 3e6df586..d8bb5b3f 100644
--- a/src/octoprint/templates/dialogs/about/supporters.jinja2
+++ b/src/octoprint/templates/dialogs/about/supporters.jinja2
@@ -1 +1 @@
-{% filter markdown %}{% filter offset_markdown_headers(2) %}{% include "_data/SUPPORTERS.md" ignore missing %}{% endfilter %}{% endfilter %}
+{% filter externalize_links %}{% filter markdown %}{% filter offset_markdown_headers(2) %}{% include "_data/SUPPORTERS.md" ignore missing %}{% endfilter %}{% endfilter %}{% endfilter %}
diff --git a/src/octoprint/templates/dialogs/about/thirdparty.jinja2 b/src/octoprint/templates/dialogs/about/thirdparty.jinja2
index ab4e48e4..1ea4b492 100644
--- a/src/octoprint/templates/dialogs/about/thirdparty.jinja2
+++ b/src/octoprint/templates/dialogs/about/thirdparty.jinja2
@@ -1 +1 @@
-{% filter markdown %}{% filter offset_markdown_headers(2) %}{% include "_data/THIRDPARTYLICENSES.md" ignore missing %}{% endfilter %}{% endfilter %}
+{% filter externalize_links %}{% filter markdown %}{% filter offset_markdown_headers(2) %}{% include "_data/THIRDPARTYLICENSES.md" ignore missing %}{% endfilter %}{% endfilter %}{% endfilter %}