diff --git a/.upgradenotes/MDL-87066-2025110409330962.yml b/.upgradenotes/MDL-87066-2025110409330962.yml
new file mode 100644
index 00000000000..20c1d5f6c4f
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+++ b/.upgradenotes/MDL-87066-2025110409330962.yml
@@ -0,0 +1,5 @@
+issueNumber: MDL-87066
+notes:
+  core:
+    - message: Added clean_string() that prevents double escaping in Mustache templates
+      type: improved