diff --git a/dashboard/backend/Dockerfile b/dashboard/backend/Dockerfile
index 8c6bb66..ca177ce 100644
--- a/dashboard/backend/Dockerfile
+++ b/dashboard/backend/Dockerfile
@@ -2,8 +2,9 @@ FROM python:3.11-slim
 
 WORKDIR /app
 
-# Install system dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
+# Install system dependencies; upgrade base packages first to pick up
+# security patches (perl-base CVE-2026-13221 / CVE-2026-42496 / CVE-2026-8376)
+RUN apt-get update && apt-get upgrade -y && apt-get install -y --no-install-recommends \
     gcc \
     && rm -rf /var/lib/apt/lists/*
 
diff --git a/dashboard/frontend/src/pages/Login.tsx b/dashboard/frontend/src/pages/Login.tsx
index 5f133ed..ccb93f9 100644
--- a/dashboard/frontend/src/pages/Login.tsx
+++ b/dashboard/frontend/src/pages/Login.tsx
@@ -168,7 +168,7 @@ export default function Login() {
 
           <Box sx={{ mt: 2, textAlign: "center" }}>
             <Typography variant="caption" color="textSecondary">
-              Demo: admin / admin123
+              Acceso por invitación
             </Typography>
           </Box>
         </CardContent>