diff --git a/src/ansys/dynamicreporting/core/common_utils.py b/src/ansys/dynamicreporting/core/common_utils.py
index f588b5b11..3dc8f1197 100644
--- a/src/ansys/dynamicreporting/core/common_utils.py
+++ b/src/ansys/dynamicreporting/core/common_utils.py
@@ -3,6 +3,8 @@
 import platform
 import re
 
+import bleach
+
 from . import DEFAULT_ANSYS_VERSION as CURRENT_VERSION
 from .constants import JSON_NECESSARY_KEYS, JSON_TEMPLATE_KEYS, REPORT_TYPES
 from .exceptions import InvalidAnsysPath
@@ -189,3 +191,68 @@ def populate_template(id_str, attr, parent_template, create_template_func, logge
     template.set_filter(filter_str=attr["item_filter"] if "item_filter" in attr else "")
 
     return template
+
+
+PROPERTIES_EXEMPT = {
+    "link_text",
+    "userdef_name",
+    "filter_x_title",
+    "filter_y_title",
+    "labels_column",
+    "labels_row",
+    "title",
+    "line_marker_text",
+    "plot_title",
+    "xtitle",
+    "ytitle",
+    "ztitle",
+    "nan_display",
+    "table_title",
+    "image_title",
+    "slider_title",
+    "TOCName",
+}
+
+
+def validate_html_dictionary(data):
+    for key, value in data.items():
+        # Do not validate HTML key
+        if key == "HTML":
+            continue
+
+        # Recursive case for nested dictionaries
+        if isinstance(value, dict):
+            # Specific checks for properties key
+            if key == "properties":
+                subdict = {k: v for k, v in value.items() if k not in PROPERTIES_EXEMPT}
+                validate_html_dictionary(subdict)
+            else:
+                validate_html_dictionary(value)
+
+        # Check for lists
+        elif isinstance(value, list):
+            validate_html_list(value, key)
+
+        # Main check for strings
+        elif isinstance(value, str):
+            cleaned_string = bleach.clean(value, strip=True)
+            if cleaned_string != value:
+                raise ValueError(f"{key} contains HTML content.")
+
+        # Ignore other types
+        else:
+            continue
+
+
+def validate_html_list(value_list, key):
+    for item in value_list:
+        if isinstance(item, str):
+            cleaned_string = bleach.clean(item, strip=True)
+            if cleaned_string != item:
+                raise ValueError(f"{key} contains HTML content.")
+        elif isinstance(item, dict):
+            validate_html_dictionary(item)
+        elif isinstance(item, list):
+            validate_html_list(item, key)
+        else:
+            continue
diff --git a/src/ansys/dynamicreporting/core/serverless/template.py b/src/ansys/dynamicreporting/core/serverless/template.py
index c8cb1bb98..53fffb2fe 100644
--- a/src/ansys/dynamicreporting/core/serverless/template.py
+++ b/src/ansys/dynamicreporting/core/serverless/template.py
@@ -8,6 +8,7 @@
 from django.template.loader import render_to_string
 from django.utils import timezone
 
+from ..common_utils import validate_html_dictionary
 from ..constants import JSON_ATTR_KEYS
 from ..exceptions import ADRException, TemplateDoesNotExist, TemplateReorderOutOfBounds
 from .base import BaseModel, StrEnum
@@ -251,6 +252,8 @@ def set_params(self, new_params: dict) -> None:
             new_params = {}
         if not isinstance(new_params, dict):
             raise TypeError("input must be a dictionary")
+        if os.getenv("ADR_VALIDATION_BETAFLAG_ANSYS") == "1":
+            validate_html_dictionary(new_params)
         self.params = json.dumps(new_params)
 
     def add_params(self, new_params: dict):
diff --git a/src/ansys/dynamicreporting/core/utils/report_objects.py b/src/ansys/dynamicreporting/core/utils/report_objects.py
index 67ad6543b..892287bea 100755
--- a/src/ansys/dynamicreporting/core/utils/report_objects.py
+++ b/src/ansys/dynamicreporting/core/utils/report_objects.py
@@ -22,6 +22,7 @@
 import pytz
 
 from . import extremely_ugly_hacks, report_utils
+from ..common_utils import validate_html_dictionary
 from ..exceptions import TemplateDoesNotExist, TemplateReorderOutOfBounds
 from .encoders import PayloaddataEncoder
 
@@ -413,6 +414,8 @@ def set_params(self, d: dict = None):
             d = {}
         if type(d) is not dict:
             raise ValueError("Error: input must be a dictionary")
+        if os.getenv("ADR_VALIDATION_BETAFLAG_ANSYS") == "1":
+            validate_html_dictionary(d)
         self.params = json.dumps(d)
         return
 
@@ -1541,6 +1544,8 @@ def set_params(self, d: dict = None):
             d = {}
         if type(d) is not dict:
             raise ValueError("Error: input must be a dictionary")
+        if os.getenv("ADR_VALIDATION_BETAFLAG_ANSYS") == "1":
+            validate_html_dictionary(d)
         self.params = json.dumps(d)
         return
 
diff --git a/tests/test_report_objects.py b/tests/test_report_objects.py
index 78564ad9c..be7e1f4aa 100755
--- a/tests/test_report_objects.py
+++ b/tests/test_report_objects.py
@@ -1,5 +1,6 @@
 import datetime
 import json
+import os
 import uuid
 
 import pytest
@@ -1964,6 +1965,62 @@ def test_unit_template() -> None:
     assert succ and succ_two and succ_three and succ_four
 
 
+@pytest.mark.ado_test
+def test_template_validation() -> None:
+    os.environ["ADR_VALIDATION_BETAFLAG_ANSYS"] = "1"
+    a = ro.Template()
+    try:
+        a.set_params(
+            {
+                "reduce_params": {
+                    "reduce_type": "row<script>This is bad</script>",
+                    "operations": [
+                        "test 1",
+                        ["test 2", 1],
+                        {"source_rows": "'Phase*'", "output_rows": "Maximum"},
+                    ],
+                },
+                "properties": {"plot": "line", "plot_title": "Reduced Table"},
+                "HTML": "<div>Test</div>",
+            }
+        )
+    except ValueError as e:
+        succ_one = "contains HTML content" in str(e)
+    try:
+        a.set_params(
+            {
+                "reduce_params": {
+                    "reduce_type": "row",
+                    "operations": [
+                        ["test 2", 1],
+                        {"source_rows": "'Phase*'", "output_rows": "Maximum"},
+                        "test 1<script>Bad</script>",
+                    ],
+                },
+                "properties": {"plot": "line", "plot_title": "Reduced Table"},
+                "HTML": "<div>Test</div>",
+            }
+        )
+    except ValueError as e:
+        succ_two = "contains HTML content" in str(e)
+    a.set_params(
+        {
+            "reduce_params": {
+                "reduce_type": "row",
+                "operations": [
+                    "test 1",
+                    ["test 2", 1],
+                    {"source_rows": "'Phase*'", "output_rows": "Maximum"},
+                ],
+            },
+            "HTML": "<div>Test</div>",
+            "properties": {"plot": "line", "plot_title": "Reduced Table<script>Bad</script>"},
+        }
+    )
+    del os.environ["ADR_VALIDATION_BETAFLAG_ANSYS"]
+    assert succ_one and succ_two
+
+
 @pytest.mark.ado_test
 def test_unit_base() -> None:
     a = ro.BaseRESTObject()