diff --git a/modules/ROOT/pages/8.1.0-release-notes.adoc b/modules/ROOT/pages/8.1.0-release-notes.adoc
index 3e7a6181b4..f1b92e85f1 100644
--- a/modules/ROOT/pages/8.1.0-release-notes.adoc
+++ b/modules/ROOT/pages/8.1.0-release-notes.adoc
@@ -132,6 +132,10 @@ The following premium plugin updates were released alongside {productname} {rele
 
 // placeholder here.
 
+=== The `content_css_cors` configuration option has been deprecated
+// #TINY-12578
+
+As of {productname} {release-version}, the `content_css_cors` configuration option has been marked as *deprecated*. It will be completely removed in the upcoming {productname} 9.0 release. As an alternative, we recommend using xref:tinymce-and-cors.adoc#crossorigin[crossorigin] instead.
 
 [[known-issues]]
 == Known issues
diff --git a/modules/ROOT/partials/configuration/content_css_cors.adoc b/modules/ROOT/partials/configuration/content_css_cors.adoc
index 5f7e3dc4e3..6f63800d97 100644
--- a/modules/ROOT/partials/configuration/content_css_cors.adoc
+++ b/modules/ROOT/partials/configuration/content_css_cors.adoc
@@ -1,6 +1,8 @@
 [[content_css_cors]]
 == `+content_css_cors+`
 
+IMPORTANT: This option has been marked as *deprecated*. It will be completely removed in the upcoming {productname} 9.0 release. As an alternative, we recommend using xref:tinymce-and-cors.adoc#crossorigin[`crossorigin`] instead.
+
 When `+content_css_cors+` is set to `+true+`, the editor will add a `+crossorigin="anonymous"+` attribute to the link tags that the StyleSheetLoader uses when loading the `+content_css+`. This allows you to host the `+content_css+` on a different server than the editor itself.
 
 *Type:* `+Boolean+`