diff --git a/ct/cryptpad.sh b/ct/cryptpad.sh
index 54ac048e3..d2b0f6b1f 100644
--- a/ct/cryptpad.sh
+++ b/ct/cryptpad.sh
@@ -30,12 +30,14 @@ function update_script() {
     msg_error "No ${APP} Installation Found!"
     exit
   fi
+  # Updates to 2026.10.0 finished without infra.js; run them again so it gets written
+  [[ -f /opt/cryptpad/config/infra.example.js && ! -f /opt/cryptpad/config/infra.js ]] && rm -f ~/.cryptpad
   if check_for_gh_release "cryptpad" "cryptpad/cryptpad"; then
     msg_info "Stopping Service"
     systemctl stop cryptpad
     msg_ok "Stopped Service"
 
-    create_backup /opt/cryptpad/config/config.js /opt/cryptpad/www/common/onlyoffice/dist
+    create_backup /opt/cryptpad/config/config.js /opt/cryptpad/config/infra.js /opt/cryptpad/www/common/onlyoffice/dist
 
     CLEAN_INSTALL=1 CLEAN_INSTALL_KEEP="blob block customize data datastore onlyoffice-conf" fetch_and_deploy_gh_release "cryptpad" "cryptpad/cryptpad" "tarball"
 
@@ -45,8 +47,30 @@ function update_script() {
     cd /opt/cryptpad
     $STD npm ci --allow-git=all
     $STD npm run install:components
-    if [ -f "/opt/cryptpad/install-onlyoffice.sh" ]; then
-      $STD bash /opt/cryptpad/install-onlyoffice.sh --accept-license
+    if [[ -d /opt/cryptpad/www/common/onlyoffice/dist ]]; then
+      $STD bash /opt/cryptpad/install-office.sh --accept-license
+    fi
+    if [[ ! -f /opt/cryptpad/config/infra.js ]]; then
+      # 2026.10.0 reads the network settings from infra.js and no longer derives the sandbox origin
+      LOCAL_IP="$LOCAL_IP" node - <<'EOF'
+const c = require("/opt/cryptpad/config/config.js");
+const i = require("/opt/cryptpad/config/infra.example.js");
+const port = c.httpPort || i.public.httpPort;
+const safePort = c.httpSafePort || port + 1;
+const origin = (c.httpUnsafeOrigin || `http://${process.env.LOCAL_IP}:${port}`).replace(/\/+$/, "");
+const sandbox = new URL(origin);
+sandbox.port = safePort;
+Object.assign(i.public, {
+  origin,
+  sandboxOrigin: (c.httpSafeOrigin || sandbox.origin).replace(/\/+$/, ""),
+  httpHost: c.httpAddress || (c.httpUnsafeOrigin ? i.public.httpHost : "0.0.0.0"),
+  httpPort: port,
+  httpSafePort: safePort,
+  externalWebsocketURL: c.externalWebsocketURL,
+  fileHost: c.fileHost,
+});
+require("fs").writeFileSync("/opt/cryptpad/config/infra.js", "module.exports = " + JSON.stringify(i, null, 4) + ";\n");
+EOF
     fi
     $STD npm run build
     msg_ok "Updated CryptaPad"
diff --git a/install/cryptpad-install.sh b/install/cryptpad-install.sh
index d74b9e875..323602f90 100644
--- a/install/cryptpad-install.sh
+++ b/install/cryptpad-install.sh
@@ -28,11 +28,15 @@ cd /opt/cryptpad
 $STD npm ci --allow-git=all
 $STD npm run install:components
 if [[ "${onlyoffice,,}" =~ ^(y|yes)$ ]]; then
-  $STD bash -c "./install-onlyoffice.sh --accept-license"
+  $STD bash -c "./install-office.sh --accept-license"
 fi
 cp config/config.example.js config/config.js
-sed -i "51s/localhost/${LOCAL_IP}/g" /opt/cryptpad/config/config.js
-sed -i "80s#//httpAddress: 'localhost'#httpAddress: '0.0.0.0'#g" /opt/cryptpad/config/config.js
+cp config/infra.example.js config/infra.js
+sed -i \
+  -e "s|origin: \"http://localhost:3000\"|origin: \"http://${LOCAL_IP}:3000\"|" \
+  -e "s|sandboxOrigin: \"http://localhost:3001\"|sandboxOrigin: \"http://${LOCAL_IP}:3001\"|" \
+  -e "s|httpHost: \"localhost\"|httpHost: \"0.0.0.0\"|" \
+  config/infra.js
 $STD npm run build
 msg_ok "Setup CryptPad"