diff --git a/src/corelib/serialization/qxmlutils.cpp b/src/corelib/serialization/qxmlutils.cpp
index 74a0cf0c23d..778e8de72de 100644
--- a/src/corelib/serialization/qxmlutils.cpp
+++ b/src/corelib/serialization/qxmlutils.cpp
@@ -235,13 +235,16 @@ bool QXmlUtils::isLetter(const QChar c)
     \sa {http://www.w3.org/TR/REC-xml/#NT-Char},
            {Extensible Markup Language (XML) 1.0 (Fourth Edition), [2] Char}
  */
-bool QXmlUtils::isChar(const QChar c)
+bool QXmlUtils::isChar(const char32_t c)
 {
-    return (c.unicode() >= 0x0020 && c.unicode() <= 0xD7FF)
-           || c.unicode() == 0x0009
-           || c.unicode() == 0x000A
-           || c.unicode() == 0x000D
-           || (c.unicode() >= 0xE000 && c.unicode() <= 0xFFFD);
+    // The valid range is defined by https://www.w3.org/TR/REC-xml/#NT-Char as following:
+    // Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
+    return (c >= 0x0020 && c <= 0xD7FF)
+           || c == 0x0009
+           || c == 0x000A
+           || c == 0x000D
+           || (c >= 0xE000 && c <= 0xFFFD)
+           || (c >= 0x10000 && c <= 0x10FFFF);
 }
 
 /*!
diff --git a/src/corelib/serialization/qxmlutils_p.h b/src/corelib/serialization/qxmlutils_p.h
index 2e709e8323c..0ad17589799 100644
--- a/src/corelib/serialization/qxmlutils_p.h
+++ b/src/corelib/serialization/qxmlutils_p.h
@@ -33,7 +33,7 @@ class Q_CORE_EXPORT QXmlUtils
 {
 public:
     static bool isEncName(QStringView encName);
-    static bool isChar(const QChar c);
+    static bool isChar(const char32_t c);
     static bool isNameChar(const QChar c);
     static bool isLetter(const QChar c);
     static bool isNCName(QStringView ncName);
diff --git a/src/xml/dom/qdom.cpp b/src/xml/dom/qdom.cpp
index 486894019c7..e0e9a465ef5 100644
--- a/src/xml/dom/qdom.cpp
+++ b/src/xml/dom/qdom.cpp
@@ -22,7 +22,7 @@
 #include <qdebug.h>
 #include <qxmlstream.h>
 #include <private/qduplicatetracker_p.h>
-
+#include <private/qstringiterator_p.h>
 
 #include <stdio.h>
 #include <limits>
@@ -156,10 +156,11 @@ static QString fixedCharData(const QString &data, bool *ok)
     }
 
     QString result;
-    for (int i = 0; i < data.size(); ++i) {
-        QChar c = data.at(i);
+    QStringIterator it(data);
+    while (it.hasNext()) {
+        const char32_t c = it.next(QChar::Null);
         if (QXmlUtils::isChar(c)) {
-            result.append(c);
+            result.append(QChar::fromUcs4(c));
         } else if (QDomImplementationPrivate::invalidDataPolicy == QDomImplementation::ReturnNullNode) {
             *ok = false;
             return QString();
diff --git a/tests/auto/xml/dom/qdom/tst_qdom.cpp b/tests/auto/xml/dom/qdom/tst_qdom.cpp
index e1c2b12ab5e..f05020f61ca 100644
--- a/tests/auto/xml/dom/qdom/tst_qdom.cpp
+++ b/tests/auto/xml/dom/qdom/tst_qdom.cpp
@@ -9,6 +9,7 @@
 #include <QFile>
 #include <QList>
 #include <QRegularExpression>
+#include <QScopeGuard>
 #include <QTextStream>
 #include <QTest>
 #include <QtXml>
@@ -62,6 +63,7 @@ private slots:
     void invalidQualifiedName();
     void invalidCharData_data();
     void invalidCharData();
+    void nonBMPCharacters();
 
     void roundTripAttributes() const;
     void roundTripCDATA() const;
@@ -1342,6 +1344,10 @@ void tst_QDom::invalidCharData_data()
     QTest::newRow( "f<o&o" )   << QString("f<o&o")     << true  << true  << true  << QString("f<o&o");
     QTest::newRow( "empty" )   << QString()            << true  << true  << true  << QString();
     QTest::newRow("f\\x07o\\x02")<< QString("f\x07o\x02")<< true  << true  << false << QString("fo");
+
+    const QChar pair[2] = { QChar(0xdc00), QChar(0xe000) };
+    QString invalid(pair, 2);
+    QTest::newRow("\\xdc00\\xe000") << invalid << true << true << false << invalid.last(1);
 }
 
 void tst_QDom::invalidCharData()
@@ -1385,6 +1391,22 @@ void tst_QDom::invalidCharData()
     }
 }
 
+void tst_QDom::nonBMPCharacters()
+{
+    const auto invalidDataPolicy = QDomImplementation::invalidDataPolicy();
+    auto resetInvalidDataPolicy = qScopeGuard(
+            [invalidDataPolicy] { QDomImplementation::setInvalidDataPolicy(invalidDataPolicy); });
+    QDomImplementation::setInvalidDataPolicy(QDomImplementation::DropInvalidChars);
+
+    const QString input = u"<text>Supplementary Plane: 𝄞 😂 🀄 🀶 🃪 🃋</text>"_qs;
+
+    QString errorMsg;
+    QDomDocument doc;
+    doc.setContent(input, &errorMsg);
+    QVERIFY(errorMsg.isEmpty());
+    QCOMPARE(doc.toString(-1), input);
+}
+
 void tst_QDom::roundTripAttributes() const
 {
     /* Create an attribute via the QDom API with weird whitespace content. */