diff --git a/js/src/autocomplete.js b/js/src/autocomplete.js
index 3a7af7b2e..413412c15 100644
--- a/js/src/autocomplete.js
+++ b/js/src/autocomplete.js
@@ -926,7 +926,7 @@ class Autocomplete extends BaseComponent {
       if (this._config.searchNoResultsLabel) {
         const placeholder = document.createElement('div')
         placeholder.classList.add(CLASS_NAME_OPTIONS_EMPTY)
-        placeholder.innerHTML = this._config.searchNoResultsLabel
+        placeholder.textContent = this._config.searchNoResultsLabel
 
         if (!SelectorEngine.findOne(SELECTOR_OPTIONS_EMPTY, this._menu)) {
           SelectorEngine.findOne(SELECTOR_OPTIONS, this._menu).append(placeholder)
diff --git a/js/src/calendar.js b/js/src/calendar.js
index 3c2ee0bb7..36dfec862 100644
--- a/js/src/calendar.js
+++ b/js/src/calendar.js
@@ -10,7 +10,7 @@ import BaseComponent from './base-component.js'
 import EventHandler from './dom/event-handler.js'
 import Manipulator from './dom/manipulator.js'
 import SelectorEngine from './dom/selector-engine.js'
-import { DefaultAllowlist, sanitizeHtml } from './util/sanitizer.js'
+import { DefaultAllowlist, escapeHtml, sanitizeHtml } from './util/sanitizer.js'
 import { defineJQueryPlugin } from './util/index.js'
 import {
   convertToDateObject,
@@ -606,10 +606,10 @@ class Calendar extends BaseComponent {
     navigationElement.classList.add('calendar-nav')
     navigationElement.innerHTML = `
       <div class="calendar-nav-prev">
-        <button type="button" class="calendar-nav-btn btn-double-prev" aria-label="${this._config.ariaNavPrevYearLabel}">
+        <button type="button" class="calendar-nav-btn btn-double-prev" aria-label="${escapeHtml(this._config.ariaNavPrevYearLabel)}">
           <span class="calendar-nav-icon calendar-nav-icon-double-prev"></span>
         </button>
-        ${this._view === 'days' ? `<button type="button" class="calendar-nav-btn btn-prev" aria-label="${this._config.ariaNavPrevMonthLabel}">
+        ${this._view === 'days' ? `<button type="button" class="calendar-nav-btn btn-prev" aria-label="${escapeHtml(this._config.ariaNavPrevMonthLabel)}">
           <span class="calendar-nav-icon calendar-nav-icon-prev"></span>
         </button>` : ''}
       </div>
@@ -622,10 +622,10 @@ class Calendar extends BaseComponent {
         </button>
       </div>
       <div class="calendar-nav-next">
-        ${this._view === 'days' ? `<button type="button" class="calendar-nav-btn btn-next" aria-label="${this._config.ariaNavNextMonthLabel}">
+        ${this._view === 'days' ? `<button type="button" class="calendar-nav-btn btn-next" aria-label="${escapeHtml(this._config.ariaNavNextMonthLabel)}">
           <span class="calendar-nav-icon calendar-nav-icon-next"></span>
         </button>` : ''}
-        <button type="button" class="calendar-nav-btn btn-double-next" aria-label="${this._config.ariaNavNextYearLabel}">
+        <button type="button" class="calendar-nav-btn btn-double-next" aria-label="${escapeHtml(this._config.ariaNavNextYearLabel)}">
           <span class="calendar-nav-icon calendar-nav-icon-double-next"></span>
         </button>
       </div>
@@ -644,7 +644,7 @@ class Calendar extends BaseComponent {
           ${this._config.showWeekNumber ?
             `<th class="${CLASS_NAME_CALENDAR_CELL}">
               <div class="calendar-header-cell-inner">
-               ${this._config.weekNumbersLabel ?? ''}
+               ${this._config.weekNumbersLabel ? escapeHtml(this._config.weekNumbersLabel) : ''}
               </div>
             </th>` : ''
           }
diff --git a/js/src/date-range-picker.js b/js/src/date-range-picker.js
index 97e90379a..c7f6fbbd9 100644
--- a/js/src/date-range-picker.js
+++ b/js/src/date-range-picker.js
@@ -779,7 +779,7 @@ class DateRangePicker extends BaseComponent {
           this._calendar.update(this._getCalendarConfig())
         })
 
-        buttonEl.innerHTML = key
+        buttonEl.textContent = key
         dateRangePickerRangesEl.append(buttonEl)
       }
 
@@ -881,7 +881,7 @@ class DateRangePicker extends BaseComponent {
       const todayButtonEl = document.createElement('button')
       todayButtonEl.classList.add(...this._getButtonClasses(this._config.todayButtonClasses))
       todayButtonEl.type = 'button'
-      todayButtonEl.innerHTML = this._config.todayButton
+      todayButtonEl.textContent = this._config.todayButton
       todayButtonEl.addEventListener('click', () => {
         const date = new Date()
         this._calendarDate = date
@@ -901,7 +901,7 @@ class DateRangePicker extends BaseComponent {
       const cancelButtonEl = document.createElement('button')
       cancelButtonEl.classList.add(...this._getButtonClasses(this._config.cancelButtonClasses))
       cancelButtonEl.type = 'button'
-      cancelButtonEl.innerHTML = this._config.cancelButton
+      cancelButtonEl.textContent = this._config.cancelButton
       cancelButtonEl.addEventListener('click', () => {
         this.cancel()
       })
@@ -913,7 +913,7 @@ class DateRangePicker extends BaseComponent {
       const confirmButtonEl = document.createElement('button')
       confirmButtonEl.classList.add(...this._getButtonClasses(this._config.confirmButtonClasses))
       confirmButtonEl.type = 'button'
-      confirmButtonEl.innerHTML = this._config.confirmButton
+      confirmButtonEl.textContent = this._config.confirmButton
       confirmButtonEl.addEventListener('click', () => {
         this.hide()
       })
diff --git a/js/src/range-slider.js b/js/src/range-slider.js
index e80279b21..f4847ec38 100644
--- a/js/src/range-slider.js
+++ b/js/src/range-slider.js
@@ -406,7 +406,9 @@ class RangeSlider extends BaseComponent {
     }
 
     if (this._tooltips[index]) {
-      this._tooltips[index].children[0].innerHTML = this._config.tooltipsFormat ? this._config.tooltipsFormat(value) : value
+      this._tooltips[index].children[0].innerHTML = this._config.tooltipsFormat ?
+        (this._config.sanitize ? sanitizeHtml(this._config.tooltipsFormat(value), this._config.allowList, this._config.sanitizeFn) : this._config.tooltipsFormat(value)) :
+        value
       const input = SelectorEngine.find(SELECTOR_RANGE_SLIDER_INPUT, this._element)[index]
       this._positionTooltip(this._tooltips[index], input)
     }
diff --git a/js/src/time-picker.js b/js/src/time-picker.js
index aecd98d5a..403bbf311 100644
--- a/js/src/time-picker.js
+++ b/js/src/time-picker.js
@@ -773,7 +773,7 @@ class TimePicker extends BaseComponent {
         ...this._getButtonClasses(this._config.cancelButtonClasses)
       )
       cancelButtonEl.type = 'button'
-      cancelButtonEl.innerHTML = this._config.cancelButton
+      cancelButtonEl.textContent = this._config.cancelButton
       cancelButtonEl.addEventListener('click', () => {
         this.cancel()
       })
@@ -787,7 +787,7 @@ class TimePicker extends BaseComponent {
         ...this._getButtonClasses(this._config.confirmButtonClasses)
       )
       confirmButtonEl.type = 'button'
-      confirmButtonEl.innerHTML = this._config.confirmButton
+      confirmButtonEl.textContent = this._config.confirmButton
       confirmButtonEl.addEventListener('click', () => {
         this.hide()
       })
diff --git a/js/tests/unit/autocomplete.spec.js b/js/tests/unit/autocomplete.spec.js
index e90490b9c..af9e44a28 100644
--- a/js/tests/unit/autocomplete.spec.js
+++ b/js/tests/unit/autocomplete.spec.js
@@ -479,6 +479,23 @@ describe('Autocomplete', () => {
       expect(autocomplete._isShown()).toBe(true)
     })
 
+    it('should render searchNoResultsLabel as text, not markup', () => {
+      fixtureEl.innerHTML = '<div class="autocomplete"></div>'
+      const autocompleteEl = fixtureEl.querySelector('.autocomplete')
+      const autocomplete = new Autocomplete(autocompleteEl, {
+        searchNoResultsLabel: '<img src=x onerror="window.xss = true">',
+        options: [{ label: 'Option 1', value: '1' }]
+      })
+
+      autocomplete.show()
+      autocomplete._search = 'nonexistent'
+      autocomplete._filterOptionsList()
+
+      const placeholder = autocomplete._menu.querySelector('.autocomplete-options-empty')
+      expect(placeholder.querySelector('img')).toBeNull()
+      expect(placeholder.textContent).toBe('<img src=x onerror="window.xss = true">')
+    })
+
     it('should show with container mode', () => {
       fixtureEl.innerHTML = '<div class="autocomplete"></div><div id="container"></div>'
       const autocompleteEl = fixtureEl.querySelector('.autocomplete')
diff --git a/js/tests/unit/calendar.spec.js b/js/tests/unit/calendar.spec.js
index 4adb7ccad..5e531e864 100644
--- a/js/tests/unit/calendar.spec.js
+++ b/js/tests/unit/calendar.spec.js
@@ -2664,5 +2664,30 @@ describe('Calendar', () => {
       expect(btnDoubleNext.getAttribute('aria-label')).toEqual('Go to next year')
       expect(btnDoublePrev.getAttribute('aria-label')).toEqual('Go to previous year')
     })
+
+    it('should escape aria labels so they cannot break out of the attribute', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      new Calendar(div, { // eslint-disable-line no-new
+        ariaNavNextYearLabel: '"><img src=x onerror="window.xss = true">'
+      })
+
+      expect(div.querySelector('.calendar-nav img')).toBeNull()
+      expect(div.querySelector('.btn-double-next').getAttribute('aria-label'))
+        .toEqual('"><img src=x onerror="window.xss = true">')
+    })
+
+    it('should escape the week numbers label', () => {
+      fixtureEl.innerHTML = '<div></div>'
+
+      const div = fixtureEl.querySelector('div')
+      new Calendar(div, { // eslint-disable-line no-new
+        showWeekNumber: true,
+        weekNumbersLabel: '<img src=x onerror="window.xss = true">'
+      })
+
+      expect(div.querySelector('.calendar-header-cell-inner img')).toBeNull()
+    })
   })
 })
diff --git a/js/tests/unit/range-slider.spec.js b/js/tests/unit/range-slider.spec.js
index 9a7904743..80e0a45c7 100644
--- a/js/tests/unit/range-slider.spec.js
+++ b/js/tests/unit/range-slider.spec.js
@@ -113,6 +113,21 @@ describe('RangeSlider', () => {
       expect(tooltips[1].textContent).toBe('150%')
     })
 
+    it('should sanitize tooltip content on the update path', () => {
+      fixtureEl.innerHTML = '<div id="slider"></div>'
+      const element = fixtureEl.querySelector('#slider')
+      const rangeSlider = new RangeSlider(element, {
+        tooltips: true,
+        value: 50,
+        tooltipsFormat: () => '<img src=x onerror="window.xss = true">'
+      })
+
+      rangeSlider._updateTooltip(0, 60)
+
+      const inner = element.querySelector('.range-slider-tooltip-inner')
+      expect(inner.querySelector('img').hasAttribute('onerror')).toBeFalse()
+    })
+
     it('should initialize with a single numeric value', () => {
       fixtureEl.innerHTML = '<div id="slider"></div>'
       const element = fixtureEl.querySelector('#slider')