From cbc5b8cebd9255e0c49e8fb02daed4680be1d336 Mon Sep 17 00:00:00 2001
From: Lain Soykaf <lain@lain.com>
Date: Fri, 2 Jun 2023 17:03:21 +0400
Subject: [PATCH 1/2] B Preload: Make sure that the preloaded json is html safe

---
 lib/pleroma/web/preload.ex | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/preload.ex b/lib/pleroma/web/preload.ex
index 4485383f9..6a4a8885e 100644
--- a/lib/pleroma/web/preload.ex
+++ b/lib/pleroma/web/preload.ex
@@ -11,7 +11,7 @@ def build_tags(_conn, params) do
         terms =
           params
           |> parser.generate_terms()
-          |> Enum.map(fn {k, v} -> {k, Base.encode64(Jason.encode!(v))} end)
+          |> Enum.map(fn {k, v} -> {k, Base.encode64(Jason.encode!(v, escape: :html_safe))} end)
           |> Enum.into(%{})
 
         Map.merge(acc, terms)
@@ -19,7 +19,7 @@ def build_tags(_conn, params) do
 
     rendered_html =
       preload_data
-      |> Jason.encode!()
+      |> Jason.encode!(escape: :html_safe)
       |> build_script_tag()
       |> HTML.safe_to_string()
 

From 40d40d67a3cee4d57f9200d0980df1b21d08a834 Mon Sep 17 00:00:00 2001
From: Lain Soykaf <lain@lain.com>
Date: Fri, 2 Jun 2023 17:09:23 +0400
Subject: [PATCH 2/2] Add changelog.

---
 changelog.d/3901.security | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 changelog.d/3901.security

diff --git a/changelog.d/3901.security b/changelog.d/3901.security
new file mode 100644
index 000000000..a3d8bd01f
--- /dev/null
+++ b/changelog.d/3901.security
@@ -0,0 +1 @@
+Preload: Make generated JSON html-safe. It already was html safe because it only consists of config data that is base64 encoded, but this will keep it safe it that ever changes.