diff --git a/hub/CHANGELOG.md b/hub/CHANGELOG.md
index 9bfa22a3..0e516951 100644
--- a/hub/CHANGELOG.md
+++ b/hub/CHANGELOG.md
@@ -13,6 +13,10 @@ Needs **agent ≥ 0.155.0** to see anything: the agent's new `deliberate_off.req
   (`os_update_stale`, `agent_behind`, `os_config_bundle_behind`, `os_reboot_needed`, `os_not_covered`, `os_ring0_stalled`)
   and the household's kernel notice mail. **After the hold**, still silent: the usual `host_down` + `node_down`, once,
   with a text naming the household power-off. Back on inside the hold: no `*_recovered` mail.
+- **Security review (same day):** the time is the BOX's clock, so a future `requested_at` is cut to the hub's now (it
+  could otherwise stretch the hold past 14 days); and a customer is held only when EVERY one of its hosts is held —
+  one switched-off machine no longer silences the customer's other machine. A read error or a customer with no host is
+  not held (the alarm fires).
 - **Pages:** hosts list, host detail and the customer/dashboard roll-up show **KIKAPCSOLVA** (grey) and „Kikapcsolva a
   háztartás által, T — riasztás szünetel eddig: T+14 nap" instead of DOWN. Delete logic still reads the raw status.
 - Tests (consequence, each with a control that must alarm): `monitor/deliberate_off_test.go` (no alarm in the hold;
diff --git a/hub/internal/api/deliberate_off.go b/hub/internal/api/deliberate_off.go
index e5e9843d..1a0a69b1 100644
--- a/hub/internal/api/deliberate_off.go
+++ b/hub/internal/api/deliberate_off.go
@@ -24,6 +24,12 @@ func (h *Handler) checkDeliberateOff(hostID, custID string, rep *hostReportPaylo
 			return
 		}
 		t = t.UTC()
+		// The time is the BOX's clock (security review 2026-10-13): a future value would stretch the hold past 14
+		// days, so it is cut to the hub's own now. An earlier value only shortens the hold — the safe direction.
+		if now := time.Now().UTC().Truncate(time.Second); t.After(now) {
+			h.logger.Printf("[WARN] host-report from %s: deliberate_off.requested_at %s is in the future — using the hub's time", hostID, t.Format(time.RFC3339))
+			t = now
+		}
 		at = &t
 	}
 	prev, err := h.store.SetHostDeliberateOff(hostID, at)
diff --git a/hub/internal/api/deliberate_off_test.go b/hub/internal/api/deliberate_off_test.go
index ffad736e..d1e38a56 100644
--- a/hub/internal/api/deliberate_off_test.go
+++ b/hub/internal/api/deliberate_off_test.go
@@ -15,7 +15,8 @@ func TestHostReport_DeliberateOffSetThenCleared(t *testing.T) {
 	h, st, _ := newTestHandler(t)
 	st.SaveCustomerConfig(&store.CustomerConfig{CustomerID: "c1", APIKey: "ckey", RetrievalPassword: "p"})
 	st.UpsertHost(&store.Host{HostID: "h1", CustomerID: "c1", APIKey: "HKEY"})
-	withOff := strings.TrimSuffix(validReportBody("h1"), "}") + `,"deliberate_off":{"requested_at":"2026-10-13T18:00:00Z"}}`
+	when := time.Now().UTC().Add(-time.Hour).Truncate(time.Second)
+	withOff := strings.TrimSuffix(validReportBody("h1"), "}") + `,"deliberate_off":{"requested_at":"` + when.Format(time.RFC3339) + `"}}`
 
 	for i := 0; i < 2; i++ { // the field rides every report until the box is down; the second must not re-record
 		if rr := do(h, http.MethodPost, "/host-report", "HKEY", withOff); rr.Code != 200 {
@@ -23,8 +24,8 @@ func TestHostReport_DeliberateOffSetThenCleared(t *testing.T) {
 		}
 	}
 	at := st.HostDeliberateOffAt("h1")
-	if at == nil || !at.Equal(time.Date(2026, 10, 13, 18, 0, 0, 0, time.UTC)) {
-		t.Fatalf("hold = %v, want 2026-10-13 18:00 UTC", at)
+	if at == nil || !at.Equal(when) {
+		t.Fatalf("hold = %v, want %v", at, when)
 	}
 	evs, _ := st.GetEventsByType("c1", eventHostDeliberateOff, time.Now().Add(-time.Hour))
 	if len(evs) != 1 || evs[0].Severity != "info" {
@@ -42,3 +43,18 @@ func TestHostReport_DeliberateOffSetThenCleared(t *testing.T) {
 		t.Fatalf("ended events = %d, want 1", len(ended))
 	}
 }
+
+// A future requested_at (the box's clock) must not stretch the hold: it is cut to the hub's now.
+func TestHostReport_DeliberateOffFutureTimeClamped(t *testing.T) {
+	h, st, _ := newTestHandler(t)
+	st.SaveCustomerConfig(&store.CustomerConfig{CustomerID: "c1", APIKey: "ckey", RetrievalPassword: "p"})
+	st.UpsertHost(&store.Host{HostID: "h1", CustomerID: "c1", APIKey: "HKEY"})
+	body := strings.TrimSuffix(validReportBody("h1"), "}") + `,"deliberate_off":{"requested_at":"2099-01-01T00:00:00Z"}}`
+	if rr := do(h, http.MethodPost, "/host-report", "HKEY", body); rr.Code != 200 {
+		t.Fatalf("report: %d", rr.Code)
+	}
+	at := st.HostDeliberateOffAt("h1")
+	if at == nil || at.After(time.Now().Add(time.Minute)) {
+		t.Fatalf("hold anchored at %v — a future box time must be cut to the hub's now", at)
+	}
+}
diff --git a/hub/internal/monitor/deliberate_off_test.go b/hub/internal/monitor/deliberate_off_test.go
index 5e5aeb35..99cbf8b7 100644
--- a/hub/internal/monitor/deliberate_off_test.go
+++ b/hub/internal/monitor/deliberate_off_test.go
@@ -168,3 +168,20 @@ func TestDeliberateOff_DeadlineSkips(t *testing.T) {
 		t.Fatalf("a switched-off box got deadline alarms: %v", got)
 	}
 }
+
+// One switched-off machine must not hold the alarms of the customer's OTHER machine (security review 2026-10-13).
+func TestDeliberateOff_OneOfTwoHostsDoesNotHoldTheCustomer(t *testing.T) {
+	r := newOffRig(t)
+	if err := r.st.UpsertHost(&store.Host{HostID: "h2", CustomerID: "c1", APIKey: "k2"}); err != nil {
+		t.Fatal(err)
+	}
+	r.offAt(t, 3*time.Hour) // only h1 is switched off
+	if _, held := r.st.CustomerDeliberatelyOff("c1", time.Now()); held {
+		t.Fatal("the customer is held although its second machine was never switched off")
+	}
+	r.silent(t, 3*time.Hour)
+	r.node.Check()
+	if !hasEvent(r.events, "node_down") {
+		t.Fatalf("the customer-level alarm was held by one machine of two: %v", r.events)
+	}
+}
diff --git a/hub/internal/store/deliberateoff.go b/hub/internal/store/deliberateoff.go
index 8906fc2e..ebc39214 100644
--- a/hub/internal/store/deliberateoff.go
+++ b/hub/internal/store/deliberateoff.go
@@ -61,27 +61,34 @@ func (s *Store) HostDeliberateOffAt(hostID string) *time.Time {
 	return parseDeliberateOff(v.String)
 }
 
-// CustomerDeliberatelyOff reports whether any of the customer's hosts is deliberately off and still within the
-// hold at now — the checkers keyed by customer use it. The time is the newest such request.
+// CustomerDeliberatelyOff reports whether the customer is switched off by the household and still within the hold
+// at now — the checkers keyed by customer use it. EVERY host of the customer must be held (security review
+// 2026-10-13): one switched-off machine must not silence the alarms of the customer's other machine. A read error
+// or a customer with no host is NOT held (fail closed: the alarm fires). The time is the newest request.
 func (s *Store) CustomerDeliberatelyOff(customerID string, now time.Time) (time.Time, bool) {
-	rows, err := s.db.Query(`SELECT deliberate_off_at FROM hosts WHERE customer_id = ? AND deliberate_off_at IS NOT NULL`, customerID)
+	rows, err := s.db.Query(`SELECT COALESCE(deliberate_off_at, '') FROM hosts WHERE customer_id = ?`, customerID)
 	if err != nil {
 		return time.Time{}, false
 	}
 	defer rows.Close()
 	var newest time.Time
-	held := false
+	n := 0
 	for rows.Next() {
 		var v string
 		if rows.Scan(&v) != nil {
-			continue
+			return time.Time{}, false
 		}
-		if t := parseDeliberateOff(v); DeliberateOffHeld(t, now) {
-			held = true
-			if t.After(newest) {
-				newest = *t
-			}
+		n++
+		t := parseDeliberateOff(v)
+		if !DeliberateOffHeld(t, now) {
+			return time.Time{}, false
+		}
+		if t.After(newest) {
+			newest = *t
 		}
 	}
-	return newest, held
+	if rows.Err() != nil || n == 0 {
+		return time.Time{}, false
+	}
+	return newest, true
 }