Backport tests for CVE-2024-34341 to v1.3

test/src/system/pasting_test.coffee

@@ -53,6 +53,34 @@ testGroup "Pasting", template: "editor_empty", ->
         delete window.unsanitized
         done()
 
+    test "paste unsafe html with noscript", (done) ->
+      window.unsanitized = []
+      pasteData =
+        "text/plain": "x",
+        "text/html": """
+          <div><noscript><div class="123</noscript>456<img src=1 onerror=window.unsanitized.push(1)//"></div></noscript></div>
+        """
+
+      pasteContent pasteData, () ->
+        after 20, () ->
+          assert.deepEqual(window.unsanitized, [])
+          delete window.unsanitized
+          done()
+
+    test "paste data-trix-attachment unsafe html", (done) ->
+      window.unsanitized = []
+      pasteData =
+        "text/plain": "x",
+        "text/html": """
+          copy<div data-trix-attachment="{&quot;contentType&quot;:&quot;text/html&quot;,&quot;content&quot;:&quot;&lt;img src=1 onerror=window.unsanitized.push(1)&gt;HELLO123&quot;}"></div>me
+        """
+
+      pasteContent pasteData, ->
+      after 20, ->
+        assert.deepEqual window.unsanitized, []
+        delete window.unsanitized
+        done()
+
   test "prefers plain text when html lacks formatting", (expectDocument) ->
     pasteData =
       "text/html": "<meta charset='utf-8'>a\nb"