diff --git a/src/public/borne/assets/js/page-cart.js b/src/public/borne/assets/js/page-cart.js
index 5354b83..677c4df 100644
--- a/src/public/borne/assets/js/page-cart.js
+++ b/src/public/borne/assets/js/page-cart.js
@@ -17,7 +17,7 @@
  * requires prices shown to end-consumers to include all taxes.
  */
 
-import { getCart, removeFromCart, updateQuantity, getTotalCents, computeMenuLineCents, clearCart, formatPrice } from './state.js';
+import { getCart, removeFromCart, updateQuantity, getTotalCents, computeMenuLineCents, clearCart, formatPrice, escHtml } from './state.js';
 import { refreshCartBadge } from './nav.js';
 
 /* TVA rate used for display breakdown only — stored prices are already TTC */
@@ -62,27 +62,27 @@ function renderCart() {
         row.innerHTML = `
             <img
                 class="cart-line__image"
-                src="${item.image}"
-                alt="${item.libelle}"
+                src="${escHtml(item.image)}"
+                alt="${escHtml(item.libelle)}"
                 onerror="this.src='assets/images/ui/logo.png'; this.alt='Image non disponible';"
             >
             <div class="cart-line__info">
-                <span class="cart-line__name">${item.libelle}</span>
+                <span class="cart-line__name">${escHtml(item.libelle)}</span>
                 <span class="cart-line__unit-price">${formatPrice(item.prix_cents)} / unite${isMenu && (item.supplement_cents ?? 0) > 0 ? ` + ${formatPrice(item.supplement_cents)} suppl.` : ''}</span>
                 ${isMenu && item.composition ? renderCompositionBlock(item) : ''}
             </div>
-            <div class="cart-line__qty" role="group" aria-label="Quantite de ${item.libelle}">
+            <div class="cart-line__qty" role="group" aria-label="Quantite de ${escHtml(item.libelle)}">
                 <button
                     class="qty-btn qty-btn--minus"
                     data-index="${index}"
-                    aria-label="Diminuer la quantite de ${item.libelle}"
+                    aria-label="Diminuer la quantite de ${escHtml(item.libelle)}"
                     type="button"
                 >-</button>
                 <span class="qty-value" aria-live="polite">${item.quantite}</span>
                 <button
                     class="qty-btn qty-btn--plus"
                     data-index="${index}"
-                    aria-label="Augmenter la quantite de ${item.libelle}"
+                    aria-label="Augmenter la quantite de ${escHtml(item.libelle)}"
                     type="button"
                 >+</button>
             </div>
@@ -90,7 +90,7 @@ function renderCart() {
             <button
                 class="cart-line__remove"
                 data-index="${index}"
-                aria-label="Supprimer ${item.libelle} du panier"
+                aria-label="Supprimer ${escHtml(item.libelle)} du panier"
                 type="button"
             >
                 <img src="assets/images/ui/trash.png" alt="" aria-hidden="true" width="24" height="24">
@@ -161,10 +161,10 @@ function renderCompositionBlock(item) {
 
     return `
         <ul class="cart-line__composition" aria-label="Composition du menu">
-            <li class="cart-line__comp-item">+ ${c.burger.libelle}${burgerOpts}</li>
-            <li class="cart-line__comp-item">+ ${c.accompagnement.libelle}${accompTailleLabel}</li>
-            <li class="cart-line__comp-item">+ ${c.boisson.libelle}${boissonTailleLabel}</li>
-            <li class="cart-line__comp-item">+ ${c.sauce.libelle}</li>
+            <li class="cart-line__comp-item">+ ${escHtml(c.burger.libelle)}${burgerOpts}</li>
+            <li class="cart-line__comp-item">+ ${escHtml(c.accompagnement.libelle)}${accompTailleLabel}</li>
+            <li class="cart-line__comp-item">+ ${escHtml(c.boisson.libelle)}${boissonTailleLabel}</li>
+            <li class="cart-line__comp-item">+ ${escHtml(c.sauce.libelle)}</li>
             ${supplTotal > 0 ? `<li class="cart-line__comp-suppl">Supplement ${nbGrandes} grande(s) : +${formatPrice(supplTotal)}</li>` : ''}
         </ul>
     `;
diff --git a/src/public/borne/assets/js/page-product.js b/src/public/borne/assets/js/page-product.js
index d345e1f..68b1d3d 100644
--- a/src/public/borne/assets/js/page-product.js
+++ b/src/public/borne/assets/js/page-product.js
@@ -16,7 +16,7 @@
  */
 
 import { findProduct } from './data.js';
-import { addToCart, formatPrice } from './state.js';
+import { addToCart, formatPrice, escHtml } from './state.js';
 import { refreshCartBadge } from './nav.js';
 import { openMenuComposer } from './page-product-menu.js';
 
@@ -59,18 +59,18 @@ async function renderProduct() {
             <div class="product-detail__image-wrap">
                 <img
                     class="product-detail__image"
-                    src="${product.image}"
-                    alt="${product.nom}"
+                    src="${escHtml(product.image)}"
+                    alt="${escHtml(product.nom)}"
                     onerror="this.src='assets/images/ui/logo.png'; this.alt='Image non disponible';"
                 >
             </div>
             <div class="product-detail__info">
-                <h1 class="product-detail__name">${product.nom}</h1>
+                <h1 class="product-detail__name">${escHtml(product.nom)}</h1>
                 <p class="product-detail__price">${formatPrice(product.prix)}</p>
                 <button
                     class="btn btn--primary btn--large product-detail__add"
                     id="add-to-cart-btn"
-                    aria-label="Ajouter ${product.nom} au panier"
+                    aria-label="Ajouter ${escHtml(product.nom)} au panier"
                     type="button"
                 >
                     Ajouter au panier
diff --git a/src/public/borne/assets/js/page-products.js b/src/public/borne/assets/js/page-products.js
index ba7df44..a51cb54 100644
--- a/src/public/borne/assets/js/page-products.js
+++ b/src/public/borne/assets/js/page-products.js
@@ -7,7 +7,7 @@
  */
 
 import { getProductsByCategory, getCategoryById, CATEGORY_ID_TO_SLUG } from './data.js';
-import { formatPrice } from './state.js';
+import { formatPrice, escHtml } from './state.js';
 
 const params      = new URLSearchParams(window.location.search);
 const categoryId  = parseInt(params.get('category'), 10) || 1;
@@ -60,14 +60,14 @@ async function renderProducts() {
                 <div class="product-card__image-wrap">
                     <img
                         class="product-card__image"
-                        src="${product.image}"
-                        alt="${product.nom}"
+                        src="${escHtml(product.image)}"
+                        alt="${escHtml(product.nom)}"
                         loading="lazy"
                         onerror="this.src='assets/images/ui/logo.png'; this.alt='Image non disponible';"
                     >
                 </div>
                 <div class="product-card__body">
-                    <span class="product-card__name">${product.nom}</span>
+                    <span class="product-card__name">${escHtml(product.nom)}</span>
                     <span class="product-card__price">${formatPrice(product.prix)}</span>
                 </div>
             `;
diff --git a/src/public/borne/assets/js/state.js b/src/public/borne/assets/js/state.js
index 6184848..08ffdec 100644
--- a/src/public/borne/assets/js/state.js
+++ b/src/public/borne/assets/js/state.js
@@ -172,3 +172,23 @@ export function formatPrice(cents) {
 export function getCartCount() {
     return getCart().reduce((sum, item) => sum + item.quantite, 0);
 }
+
+/* --- HTML escaping ------------------------------------------------------- */
+
+/**
+ * Minimal HTML escaping for data-derived strings (product names, image paths,
+ * libelles) injected into innerHTML. RG-T15 (anti-XSS) requires every catalogue
+ * value rendered as HTML to be escaped. Centralised here so all page modules
+ * that build markup from data escape identically; mirrors the helper that was
+ * local to page-product-menu.js.
+ * @param {*} str
+ * @returns {string}
+ */
+export function escHtml(str) {
+    return String(str)
+        .replace(/&/g, '&amp;')
+        .replace(/</g, '&lt;')
+        .replace(/>/g, '&gt;')
+        .replace(/"/g, '&quot;')
+        .replace(/'/g, '&#39;');
+}