diff --git a/dashboard/js/api.js b/dashboard/js/api.js
index 20b0f1f..eb5c6d0 100644
--- a/dashboard/js/api.js
+++ b/dashboard/js/api.js
@@ -1,3 +1,14 @@
+// Échappe les valeurs serveur avant injection dans innerHTML
+function esc(s) {
+    if (s == null) return '—';
+    return String(s)
+        .replace(/&/g, '&')
+        .replace(/</g, '&lt;')
+        .replace(/>/g, '&gt;')
+        .replace(/"/g, '&quot;')
+        .replace(/'/g, '&#39;');
+}
+
 const API = (() => {
     const BASE = '';  // même origine, proxy Nginx vers le serveur Go
 
diff --git a/dashboard/js/app.js b/dashboard/js/app.js
index 1489009..4546ba4 100644
--- a/dashboard/js/app.js
+++ b/dashboard/js/app.js
@@ -1,6 +1,7 @@
 const App = (() => {
     let _ws = null;
     let _reconnectDelay = 1000;
+    let _reconnectTimer = null;
     let _serverConfig = null;
 
     // Tooltip global position:fixed
@@ -62,7 +63,8 @@ const App = (() => {
         };
 
         _ws.onclose = () => {
-            setTimeout(connectWS, _reconnectDelay);
+            clearTimeout(_reconnectTimer);
+            _reconnectTimer = setTimeout(connectWS, _reconnectDelay);
             _reconnectDelay = Math.min(_reconnectDelay * 2, 30000);
         };
     }
diff --git a/dashboard/js/grid.js b/dashboard/js/grid.js
index 649f11b..06dcf65 100644
--- a/dashboard/js/grid.js
+++ b/dashboard/js/grid.js
@@ -61,12 +61,12 @@ const Grid = (() => {
             <span style="display:flex;align-items:center;justify-content:center;width:100%;height:100%;color:var(--accent)">
               <i class="fa-solid fa-server"></i></span>`;
 
-        return `<div class="tile ${sc}" id="tile-${id}" onclick="Popups.showDetail('${id}')">
+        return `<div class="tile ${sc}" id="tile-${id}" onclick="Popups.showDetail('${esc(id)}')">
           <div class="tile-head">
             <div class="t-icon">${iconContent}</div>
             <div class="t-names">
-              <div class="t-host">${agent.hostname}</div>
-              <div class="t-ip">${agent.ip || '—'}</div>
+              <div class="t-host">${esc(agent.hostname)}</div>
+              <div class="t-ip">${esc(agent.ip) || '—'}</div>
             </div>
             <div class="t-led ${ledClass(agent.status)}"></div>
           </div>
diff --git a/dashboard/js/popups.js b/dashboard/js/popups.js
index 6a7b3a1..b8e624f 100644
--- a/dashboard/js/popups.js
+++ b/dashboard/js/popups.js
@@ -1,6 +1,7 @@
 const Popups = (() => {
     let _currentAgentId = null;
     let _agentCfgData = null;
+    let _resizeObs = null;
 
     // ══ POPUP DÉTAIL ══
     async function showDetail(agentId) {
@@ -50,7 +51,7 @@ const Popups = (() => {
         const memPts = Charts.historyToMemPts(history);
 
         const smartBtn = metrics?.smart
-            ? `<div class="smart-btn ok" onclick="Popups.showSmart('${agentId}')" data-tip="Voir la santé complète du disque">
+            ? `<div class="smart-btn ok" onclick="Popups.showSmart('${esc(agentId)}')" data-tip="Voir la santé complète du disque">
                 <div class="smart-dot"></div>
                 <span style="font-weight:600">SMART</span>
                 <span>·</span>
@@ -116,8 +117,8 @@ const Popups = (() => {
           <div>
             <div class="sec-title">INFORMATIONS</div>
             <div class="meta-grid">
-              <div class="meta"><div class="meta-lbl">HOSTNAME</div><div class="meta-val">${agent.hostname}</div></div>
-              <div class="meta"><div class="meta-lbl">ADRESSE IP</div><div class="meta-val">${agent.ip || '—'}</div></div>
+              <div class="meta"><div class="meta-lbl">HOSTNAME</div><div class="meta-val">${esc(agent.hostname)}</div></div>
+              <div class="meta"><div class="meta-lbl">ADRESSE IP</div><div class="meta-val">${esc(agent.ip) || '—'}</div></div>
               <div class="meta"><div class="meta-lbl">PROTOCOLES ACTIFS</div><div style="display:flex;gap:5px;margin-top:4px">${protos || '—'}</div></div>
               <div class="meta"><div class="meta-lbl">DERNIER CONTACT</div><div class="meta-val">${new Date(agent.last_seen * 1000).toLocaleTimeString('fr-FR')}</div></div>
             </div>
@@ -129,14 +130,16 @@ const Popups = (() => {
         });
 
         // Resize → sauvegarder sur serveur
+        if (_resizeObs) _resizeObs.disconnect();
         const pd = document.getElementById('popup-detail');
-        new ResizeObserver(() => {
+        _resizeObs = new ResizeObserver(() => {
             API.putServerConfig({
                 ...App.serverConfig,
                 popup_detail_w: pd.offsetWidth,
                 popup_detail_h: pd.offsetHeight,
             }).catch(() => {});
-        }).observe(pd);
+        });
+        _resizeObs.observe(pd);
 
         document.getElementById('overlay-detail').style.display = 'flex';
     }