diff --git a/install.sh b/install.sh
index 46f4cd6..7093cb4 100755
--- a/install.sh
+++ b/install.sh
@@ -110,8 +110,10 @@ detect_distro() {
     fi
     
     # Check for Ubuntu 24.04 (Noble Numbat)
-    if [[ "$VERSION" != "24.04" ]] && [[ "$CODENAME" != "noble" ]]; then
-        echo -e "${YELLOW}Warning: This installer is optimized for Ubuntu 24.04${NC}"
+    # SECURITY: Use OR (||) to warn if EITHER version or codename doesn't match
+    # This ensures we catch all incompatible systems, not just when both are wrong
+    if [[ "$VERSION" != "24.04" ]] || [[ "$CODENAME" != "noble" ]]; then
+        echo -e "${YELLOW}Warning: This installer is optimized for Ubuntu 24.04 (Noble Numbat)${NC}"
         echo "  Detected: Ubuntu $VERSION ($CODENAME)"
         echo "  Continuing anyway, but some features may not work correctly"
         read -p "Continue anyway? (y/n) " -n 1 -r
diff --git a/internal/httpapp/audit_middleware.go b/internal/httpapp/audit_middleware.go
index b2bc17e..15ed868 100644
--- a/internal/httpapp/audit_middleware.go
+++ b/internal/httpapp/audit_middleware.go
@@ -16,7 +16,7 @@ func (a *App) auditMiddleware(next http.Handler) http.Handler {
 		}
 
 		// Skip audit for public endpoints
-		if a.isPublicEndpoint(r.URL.Path) {
+		if a.isPublicEndpoint(r.URL.Path, r.Method) {
 			next.ServeHTTP(w, r)
 			return
 		}
diff --git a/internal/httpapp/auth_middleware.go b/internal/httpapp/auth_middleware.go
index d46fa0f..a18a498 100644
--- a/internal/httpapp/auth_middleware.go
+++ b/internal/httpapp/auth_middleware.go
@@ -18,7 +18,7 @@ const (
 func (a *App) authMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		// Skip auth for public endpoints (includes web UI pages and read-only GET endpoints)
-		if a.isPublicEndpoint(r.URL.Path) {
+		if a.isPublicEndpoint(r.URL.Path, r.Method) {
 			next.ServeHTTP(w, r)
 			return
 		}
@@ -98,7 +98,9 @@ func (a *App) requireRole(allowedRoles ...models.Role) func(http.Handler) http.H
 }
 
 // isPublicEndpoint checks if an endpoint is public (no auth required)
-func (a *App) isPublicEndpoint(path string) bool {
+// It validates both path and HTTP method to prevent unauthenticated mutations
+func (a *App) isPublicEndpoint(path, method string) bool {
+	// Always public paths (any method)
 	publicPaths := []string{
 		"/healthz",
 		"/health",
@@ -126,13 +128,14 @@ func (a *App) isPublicEndpoint(path string) bool {
 		}
 	}
 
-	// Static files are public
+	// Static files are public (any method)
 	if strings.HasPrefix(path, "/static/") {
 		return true
 	}
 
-	// Make read-only GET endpoints public for web UI (but require auth for mutations)
-	// This allows the UI to display data without login, but operations require auth
+	// Read-only GET endpoints are public for web UI (but require auth for mutations)
+	// SECURITY: Only GET requests are allowed without authentication
+	// POST, PUT, DELETE, PATCH require authentication
 	publicReadOnlyPaths := []string{
 		"/api/v1/dashboard",         // Dashboard data
 		"/api/v1/disks",             // List disks
@@ -149,7 +152,9 @@ func (a *App) isPublicEndpoint(path string) bool {
 
 	for _, publicPath := range publicReadOnlyPaths {
 		if path == publicPath {
-			return true
+			// Only allow GET requests without authentication
+			// All mutation methods (POST, PUT, DELETE, PATCH) require authentication
+			return method == http.MethodGet
 		}
 	}
 
diff --git a/internal/httpapp/cache_middleware.go b/internal/httpapp/cache_middleware.go
index 3d1752e..81c883a 100644
--- a/internal/httpapp/cache_middleware.go
+++ b/internal/httpapp/cache_middleware.go
@@ -137,7 +137,7 @@ func (a *App) cacheMiddleware(next http.Handler) http.Handler {
 		}
 
 		// Skip caching for authenticated endpoints that may have user-specific data
-		if !a.isPublicEndpoint(r.URL.Path) {
+		if !a.isPublicEndpoint(r.URL.Path, r.Method) {
 			// Check if user is authenticated - if so, skip caching
 			// In production, you might want per-user caching by including user ID in cache key
 			if _, ok := getUserFromContext(r); ok {
diff --git a/internal/httpapp/https_middleware.go b/internal/httpapp/https_middleware.go
index 3523494..f798f2a 100644
--- a/internal/httpapp/https_middleware.go
+++ b/internal/httpapp/https_middleware.go
@@ -11,7 +11,7 @@ import (
 func (a *App) httpsEnforcementMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		// Skip HTTPS enforcement for health checks and localhost
-		if a.isPublicEndpoint(r.URL.Path) || isLocalhost(r) {
+		if a.isPublicEndpoint(r.URL.Path, r.Method) || isLocalhost(r) {
 			next.ServeHTTP(w, r)
 			return
 		}
@@ -53,7 +53,7 @@ func isLocalhost(r *http.Request) bool {
 func (a *App) requireHTTPSMiddleware(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		// Skip for health checks
-		if a.isPublicEndpoint(r.URL.Path) {
+		if a.isPublicEndpoint(r.URL.Path, r.Method) {
 			next.ServeHTTP(w, r)
 			return
 		}
diff --git a/internal/httpapp/maintenance_middleware.go b/internal/httpapp/maintenance_middleware.go
index 6fdd098..49278db 100644
--- a/internal/httpapp/maintenance_middleware.go
+++ b/internal/httpapp/maintenance_middleware.go
@@ -15,7 +15,7 @@ func (a *App) maintenanceMiddleware(next http.Handler) http.Handler {
 			return
 		}
 
-		if a.isPublicEndpoint(r.URL.Path) {
+		if a.isPublicEndpoint(r.URL.Path, r.Method) {
 			next.ServeHTTP(w, r)
 			return
 		}
diff --git a/internal/httpapp/rate_limit.go b/internal/httpapp/rate_limit.go
index 68cbbc2..8167098 100644
--- a/internal/httpapp/rate_limit.go
+++ b/internal/httpapp/rate_limit.go
@@ -134,7 +134,7 @@ func (a *App) rateLimitMiddleware(next http.Handler) http.Handler {
 
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		// Skip rate limiting for public endpoints
-		if a.isPublicEndpoint(r.URL.Path) {
+		if a.isPublicEndpoint(r.URL.Path, r.Method) {
 			next.ServeHTTP(w, r)
 			return
 		}
diff --git a/internal/httpapp/security_middleware.go b/internal/httpapp/security_middleware.go
index 032dd93..e153d90 100644
--- a/internal/httpapp/security_middleware.go
+++ b/internal/httpapp/security_middleware.go
@@ -98,7 +98,7 @@ func (a *App) validateContentTypeMiddleware(next http.Handler) http.Handler {
 		}
 
 		// Skip for public endpoints
-		if a.isPublicEndpoint(r.URL.Path) {
+		if a.isPublicEndpoint(r.URL.Path, r.Method) {
 			next.ServeHTTP(w, r)
 			return
 		}