diff --git a/scripts/oxlint.sh b/scripts/oxlint.sh
index 95f48afabb6b..604acae86c33 100755
--- a/scripts/oxlint.sh
+++ b/scripts/oxlint.sh
@@ -55,7 +55,9 @@ if [ ${#js_ts_files[@]} -gt 0 ]; then
     echo "$output" >&2
     exit 1
   }
-  [ -n "$output" ] && echo "$output"
+  if [ -n "$output" ]; then
+    echo "$output"
+  fi
 else
   echo "No JavaScript/TypeScript files to lint"
 fi
diff --git a/superset-frontend/plugins/legacy-plugin-chart-partition/src/Partition.ts b/superset-frontend/plugins/legacy-plugin-chart-partition/src/Partition.ts
index db5d47726a88..cd57ecc22e88 100644
--- a/superset-frontend/plugins/legacy-plugin-chart-partition/src/Partition.ts
+++ b/superset-frontend/plugins/legacy-plugin-chart-partition/src/Partition.ts
@@ -27,6 +27,7 @@ import {
   getNumberFormatter,
   getTimeFormatter,
   CategoricalColorNamespace,
+  sanitizeHtml,
 } from '@superset-ui/core';
 
 interface PartitionDataNode {
@@ -345,7 +346,7 @@ function Icicle(element: HTMLElement, props: IcicleProps): void {
       t += '</tbody></table>';
       const [tipX, tipY] = d3.mouse(element);
       tip
-        .html(t)
+        .html(sanitizeHtml(t))
         .style('left', `${tipX + 15}px`)
         .style('top', `${tipY}px`);
     }
diff --git a/superset-frontend/plugins/legacy-plugin-chart-rose/src/Rose.ts b/superset-frontend/plugins/legacy-plugin-chart-rose/src/Rose.ts
index 32a3242bbc38..14a5a655ccdf 100644
--- a/superset-frontend/plugins/legacy-plugin-chart-rose/src/Rose.ts
+++ b/superset-frontend/plugins/legacy-plugin-chart-rose/src/Rose.ts
@@ -27,6 +27,7 @@ import {
   getTimeFormatter,
   getNumberFormatter,
   CategoricalColorNamespace,
+  sanitizeHtml,
 } from '@superset-ui/core';
 
 interface RoseDataEntry {
@@ -146,24 +147,32 @@ function Rose(element: HTMLElement, props: RoseProps): void {
   function legendData(adatum: RoseData) {
     return adatum[times[0]].map((v: RoseDataEntry, i: number) => ({
       disabled: state.disabled[i],
-      key: v.name,
+      // nvd3-fork's legend currently renders `key` via .text(), so raw
+      // markup would be escaped today. Sanitize at the data boundary
+      // anyway: it makes the safety property a local invariant rather
+      // than depending on the vendored legend's render choice.
+      key: sanitizeHtml(v.name),
     }));
   }
 
   function tooltipData(d: ArcDatum, i: number, adatum: RoseData) {
     const timeIndex = Math.floor(d.arcId / numGroups);
+    // nvd3-fork's nv.models.tooltip renders the `key` strings via .html(),
+    // so any HTML in user-controlled column values would execute. Pass the
+    // keys through sanitizeHtml to strip dangerous markup while preserving
+    // legitimate text content.
     const series = useRichTooltip
       ? adatum[times[timeIndex]]
           .filter(v => !state.disabled[v.id % numGroups])
           .map(v => ({
-            key: v.name,
+            key: sanitizeHtml(v.name),
             value: v.value,
             color: colorFn(v.name, sliceId),
             highlight: v.id === d.arcId,
           }))
       : [
           {
-            key: d.name,
+            key: sanitizeHtml(d.name),
             value: d.val,
             color: colorFn(d.name, sliceId),
           },
diff --git a/superset-frontend/plugins/legacy-preset-chart-nvd3/src/utils.ts b/superset-frontend/plugins/legacy-preset-chart-nvd3/src/utils.ts
index 9fdeeeafa614..4474d50672e3 100644
--- a/superset-frontend/plugins/legacy-preset-chart-nvd3/src/utils.ts
+++ b/superset-frontend/plugins/legacy-preset-chart-nvd3/src/utils.ts
@@ -152,7 +152,7 @@ export function generateMultiLineTooltipContent(d, xFormatter, yFormatters) {
 
   d.series.forEach((series, i) => {
     const yFormatter = yFormatters[i];
-    const key = getFormattedKey(series.key, false);
+    const key = getFormattedKey(series.key, true);
     tooltip +=
       "<tr><td class='legend-color-guide'>" +
       `<div style="background-color: ${series.color};"></div></td>` +
@@ -162,7 +162,7 @@ export function generateMultiLineTooltipContent(d, xFormatter, yFormatters) {
 
   tooltip += '</tbody></table>';
 
-  return tooltip;
+  return dompurify.sanitize(tooltip);
 }
 
 export function generateTimePivotTooltip(d, xFormatter, yFormatter) {
@@ -223,7 +223,7 @@ export function generateBubbleTooltipContent({
   s += createHTMLRow(getLabel(sizeField), sizeFormatter(point.size));
   s += '</table>';
 
-  return s;
+  return dompurify.sanitize(s);
 }
 
 // shouldRemove indicates whether the nvtooltips should be removed from the DOM
@@ -262,11 +262,16 @@ export function wrapTooltip(chart) {
       : chart;
   const tooltipGeneratorFunc = tooltipLayer.tooltip.contentGenerator();
   tooltipLayer.tooltip.contentGenerator(d => {
-    let tooltip = `<div>`;
-    tooltip += tooltipGeneratorFunc(d);
-    tooltip += '</div>';
-
-    return tooltip;
+    // The nvd3-fork default contentGenerator builds tooltip HTML with
+    // unescaped series keys (and feeds them into the tooltip's `.html()`
+    // sink at render time). Run the final string through DOMPurify so
+    // charts that do NOT install a custom contentGenerator (Line, Bar,
+    // Area, Pie, BoxPlot, etc.) cannot execute stored payloads in
+    // column or series names. Custom contentGenerators set elsewhere in
+    // this module already return sanitized output, making this a
+    // belt-and-braces wrap.
+    const tooltip = `<div>${tooltipGeneratorFunc(d)}</div>`;
+    return dompurify.sanitize(tooltip);
   });
 }
 
@@ -279,17 +284,19 @@ export function tipFactory(layer) {
       if (!d) {
         return '';
       }
-      const title =
+      const rawTitle =
         d[layer.titleColumn] && d[layer.titleColumn].length > 0
           ? `${d[layer.titleColumn]} - ${layer.name}`
           : layer.name;
-      const body = Array.isArray(layer.descriptionColumns)
+      const rawBody = Array.isArray(layer.descriptionColumns)
         ? layer.descriptionColumns.map(c => d[c])
         : Object.values(d);
 
-      return `<div><strong>${title}</strong></div><br/><div>${body.join(
-        ', ',
-      )}</div>`;
+      return dompurify.sanitize(
+        `<div><strong>${rawTitle}</strong></div><br/><div>${rawBody.join(
+          ', ',
+        )}</div>`,
+      );
     });
 }
 
diff --git a/superset-frontend/plugins/legacy-preset-chart-nvd3/test/utils.test.ts b/superset-frontend/plugins/legacy-preset-chart-nvd3/test/utils.test.ts
index a883d4c6b7f4..a20fa38411c5 100644
--- a/superset-frontend/plugins/legacy-preset-chart-nvd3/test/utils.test.ts
+++ b/superset-frontend/plugins/legacy-preset-chart-nvd3/test/utils.test.ts
@@ -24,8 +24,11 @@ import {
 
 import {
   computeYDomain,
+  generateBubbleTooltipContent,
+  generateMultiLineTooltipContent,
   getTimeOrNumberFormatter,
   formatLabel,
+  tipFactory,
 } from '../src/utils';
 
 const DATA = [
@@ -181,4 +184,96 @@ describe('nvd3/utils', () => {
       ]);
     });
   });
+
+  // ------------------------------------------------------------------
+  // Tooltip HTML sanitisation (XSS regression).
+  // Each helper below feeds user-controlled column values into a
+  // d3 / nvd3 .html() sink; the sanitised return must strip dangerous
+  // markup so a stored payload cannot execute on hover.
+  // ------------------------------------------------------------------
+
+  describe('generateBubbleTooltipContent() sanitises user input', () => {
+    test('strips <script> from the entity column', () => {
+      const html = generateBubbleTooltipContent({
+        point: {
+          color: 'red',
+          group: 'g',
+          entity: '<script>alert(1)</script>',
+          x: 1,
+          y: 2,
+          size: 3,
+        },
+        entity: 'entity',
+        xField: 'x',
+        yField: 'y',
+        sizeField: 'size',
+        xFormatter: (v: number) => String(v),
+        yFormatter: (v: number) => String(v),
+        sizeFormatter: (v: number) => String(v),
+      });
+      expect(html).not.toMatch(/<script/i);
+      expect(html).not.toMatch(/onerror=/i);
+    });
+
+    test('strips <img onerror> injected via the group column', () => {
+      const html = generateBubbleTooltipContent({
+        point: {
+          color: 'red',
+          group: '<img src=x onerror=alert(1)>',
+          entity: 'safe',
+          x: 1,
+          y: 2,
+          size: 3,
+        },
+        entity: 'entity',
+        xField: 'x',
+        yField: 'y',
+        sizeField: 'size',
+        xFormatter: (v: number) => String(v),
+        yFormatter: (v: number) => String(v),
+        sizeFormatter: (v: number) => String(v),
+      });
+      expect(html).not.toMatch(/onerror/i);
+    });
+  });
+
+  describe('generateMultiLineTooltipContent() sanitises user input', () => {
+    test('strips <script> from a series key', () => {
+      const html = generateMultiLineTooltipContent(
+        {
+          value: 0,
+          series: [
+            {
+              key: '<script>alert(1)</script>',
+              color: 'red',
+              value: 1,
+            },
+          ],
+        },
+        (v: number) => String(v),
+        [(v: number) => String(v)],
+      );
+      expect(html).not.toMatch(/<script/i);
+    });
+  });
+
+  describe('tipFactory() sanitises annotation columns', () => {
+    test('strips <script> from a description column value', () => {
+      const tip = tipFactory({
+        annotationTipClass: 'foo',
+        titleColumn: 'title',
+        descriptionColumns: ['desc'],
+        name: 'layer',
+      });
+      // d3-tip's .html(fn) stores the callback as the renderer; invoke
+      // it directly to assert the sanitised output.
+      const datum = {
+        title: 'normal',
+        desc: '<script>alert(1)</script>payload',
+      };
+      const html = tip.html()(datum);
+      expect(html).not.toMatch(/<script/i);
+      expect(html).toContain('payload');
+    });
+  });
 });