diff --git a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/BoxPlot/transformProps.ts b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/BoxPlot/transformProps.ts
index 70129bebf55..420287c7a9b 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/BoxPlot/transformProps.ts
+++ b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/BoxPlot/transformProps.ts
@@ -30,7 +30,7 @@ import {
   BoxPlotQueryFormData,
   EchartsBoxPlotChartProps,
 } from './types';
-import { extractGroupbyLabel, getColtypesMapping } from '../utils/series';
+import { extractGroupbyLabel, getColtypesMapping, sanitizeHtml } from '../utils/series';
 import { defaultGrid, defaultTooltip, defaultYAxis } from '../defaults';
 
 export default function transformProps(
@@ -103,7 +103,9 @@ export default function transformProps(
           tooltip: {
             formatter: (param: { data: [string, number] }) => {
               const [outlierName, stats] = param.data;
-              const headline = groupby ? `<p><strong>${outlierName}</strong></p>` : '';
+              const headline = groupby
+                ? `<p><strong>${sanitizeHtml(outlierName)}</strong></p>`
+                : '';
               return `${headline}${numberFormatter(stats)}`;
             },
           },
@@ -161,7 +163,7 @@ export default function transformProps(
             value: [number, number, number, number, number, number, number, number, number[]];
             name: string;
           } = param;
-          const headline = name ? `<p><strong>${name}</strong></p>` : '';
+          const headline = name ? `<p><strong>${sanitizeHtml(name)}</strong></p>` : '';
           const stats = [
             `Max: ${numberFormatter(value[5])}`,
             `3rd Quartile: ${numberFormatter(value[4])}`,
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Funnel/transformProps.ts b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Funnel/transformProps.ts
index 5f15d849988..ee1772de204 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Funnel/transformProps.ts
+++ b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Funnel/transformProps.ts
@@ -35,7 +35,12 @@ import {
   FunnelChartTransformedProps,
 } from './types';
 import { DEFAULT_LEGEND_FORM_DATA } from '../types';
-import { extractGroupbyLabel, getChartPadding, getLegendProps } from '../utils/series';
+import {
+  extractGroupbyLabel,
+  getChartPadding,
+  getLegendProps,
+  sanitizeHtml,
+} from '../utils/series';
 import { defaultGrid, defaultTooltip } from '../defaults';
 
 const percentFormatter = getNumberFormatter(NumberFormats.PERCENT_2_POINT);
@@ -49,7 +54,8 @@ export function formatFunnelLabel({
   labelType: EchartsFunnelLabelTypeType;
   numberFormatter: NumberFormatter;
 }): string {
-  const { name = '', value, percent } = params;
+  const { name: rawName = '', value, percent } = params;
+  const name = sanitizeHtml(rawName);
   const formattedValue = numberFormatter(value as number);
   const formattedPercent = percentFormatter((percent as number) / 100);
   switch (labelType) {
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Graph/transformProps.ts b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Graph/transformProps.ts
index bfcf04b91a1..e3465512287 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Graph/transformProps.ts
+++ b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Graph/transformProps.ts
@@ -34,7 +34,7 @@ import {
 } from './types';
 import { DEFAULT_GRAPH_SERIES_OPTION } from './constants';
 import { EchartsProps } from '../types';
-import { getChartPadding, getLegendProps } from '../utils/series';
+import { getChartPadding, getLegendProps, sanitizeHtml } from '../utils/series';
 
 type EdgeWithStyles = GraphEdgeItemOption & {
   lineStyle: Exclude<GraphEdgeItemOption['lineStyle'], undefined>;
@@ -127,7 +127,9 @@ function edgeFormatter(
 ): string {
   const source = Number(sourceIndex);
   const target = Number(targetIndex);
-  return `${getKeyByValue(nodes, source)} > ${getKeyByValue(nodes, target)} : ${value}`;
+  return `${sanitizeHtml(getKeyByValue(nodes, source))} > ${sanitizeHtml(
+    getKeyByValue(nodes, target),
+  )} : ${value}`;
 }
 
 function getCategoryName(columnName: string, name?: DataRecordValue) {
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Pie/transformProps.ts b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Pie/transformProps.ts
index bfc240380bf..7cd47187cb1 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Pie/transformProps.ts
+++ b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/Pie/transformProps.ts
@@ -40,6 +40,7 @@ import {
   getChartPadding,
   getColtypesMapping,
   getLegendProps,
+  sanitizeHtml,
 } from '../utils/series';
 import { defaultGrid, defaultTooltip } from '../defaults';
 
@@ -54,7 +55,8 @@ export function formatPieLabel({
   labelType: EchartsPieLabelType;
   numberFormatter: NumberFormatter;
 }): string {
-  const { name = '', value, percent } = params;
+  const { name: rawName = '', value, percent } = params;
+  const name = sanitizeHtml(rawName);
   const formattedValue = numberFormatter(value as number);
   const formattedPercent = percentFormatter((percent as number) / 100);
 
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/utils/prophet.ts b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/utils/prophet.ts
index 86af47b19c6..2c23113864f 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/utils/prophet.ts
+++ b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/utils/prophet.ts
@@ -20,6 +20,7 @@ import { TimeseriesDataRecord, NumberFormatter } from '@superset-ui/core';
 import { CallbackDataParams, OptionName } from 'echarts/types/src/util/types';
 import { TooltipMarker } from 'echarts/types/src/util/format';
 import { ForecastSeriesContext, ForecastSeriesEnum, ProphetValue } from '../types';
+import { sanitizeHtml } from './series';
 
 const seriesTypeRegex = new RegExp(
   `(.+)(${ForecastSeriesEnum.ForecastLower}|${ForecastSeriesEnum.ForecastTrend}|${ForecastSeriesEnum.ForecastUpper})$`,
@@ -73,7 +74,7 @@ export const formatProphetTooltipSeries = ({
   marker: TooltipMarker;
   formatter: NumberFormatter;
 }): string => {
-  let row = `${marker}${seriesName}: `;
+  let row = `${marker}${sanitizeHtml(seriesName)}: `;
   let isObservation = false;
   if (observation) {
     isObservation = true;
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/utils/series.ts b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/utils/series.ts
index 2cb7ad4b9a5..0e1db573ba8 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/utils/series.ts
+++ b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/src/utils/series.ts
@@ -26,7 +26,7 @@ import {
   TimeFormatter,
   TimeseriesDataRecord,
 } from '@superset-ui/core';
-import { LegendComponentOption, SeriesOption } from 'echarts';
+import { format, LegendComponentOption, SeriesOption } from 'echarts';
 import { NULL_STRING, TIMESERIES_CONSTANTS } from '../constants';
 import { LegendOrientation, LegendType } from '../types';
 import { defaultLegendPadding } from '../defaults';
@@ -200,3 +200,7 @@ export function dedupSeries(series: SeriesOption[]): SeriesOption[] {
     };
   });
 }
+
+export function sanitizeHtml(text: string): string {
+  return format.encodeHTML(text);
+}
diff --git a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/test/utils/series.test.ts b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/test/utils/series.test.ts
index c0f3a3b87d5..d5d3dd89fa2 100644
--- a/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/test/utils/series.test.ts
+++ b/superset-frontend/temporary_superset_ui/superset-ui/plugins/plugin-chart-echarts/test/utils/series.test.ts
@@ -24,9 +24,11 @@ import {
   formatSeriesName,
   getChartPadding,
   getLegendProps,
+  sanitizeHtml,
 } from '../../src/utils/series';
 import { LegendOrientation, LegendType } from '../../src/types';
 import { defaultLegendPadding } from '../../src/defaults';
+import { NULL_STRING } from '../../lib/constants';
 
 describe('extractTimeseriesSeries', () => {
   it('should generate a valid ECharts timeseries series object', () => {
@@ -350,4 +352,10 @@ describe('formatSeriesName', () => {
       ).toEqual([{ id: 'foo' }, { id: 'bar' }, { id: 'foo (1)' }, { id: 'foo (2)' }]);
     });
   });
+
+  describe('sanitizeHtml', () => {
+    it('should remove html tags from series name', () => {
+      expect(sanitizeHtml(NULL_STRING)).toEqual('&lt;NULL&gt;');
+    });
+  });
 });