diff --git a/changes/ce/fix-12940.en.md b/changes/ce/fix-12940.en.md
new file mode 100644
index 000000000..8304effd5
--- /dev/null
+++ b/changes/ce/fix-12940.en.md
@@ -0,0 +1,3 @@
+Fix config update API `/configs` 500 error when config has bad HOCON syntax.
+
+Now bad syntax will cause the API to return 400 (BAD_REQUEST).