diff --git a/cmd/mavweb/chat.go b/cmd/mavweb/chat.go
index e78a9ff..6091f5a 100644
--- a/cmd/mavweb/chat.go
+++ b/cmd/mavweb/chat.go
@@ -131,11 +131,12 @@ func handleChatAPI(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, ses
 // optionally the intent it should have been. An unstated target is accepted,
 // because a turn marked wrong with no target is still a usable negative.
 //
-// Not step-up gated, unlike POST /api/chat. Writing a label reaches no router,
-// no model and no act path; it writes one row nothing executes from. Gating it
-// would price the gesture out of being used, which is the one thing that makes
-// it worthless.
-func handleCorrectAPI(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI) {
+// Step-up gated like POST /api/chat, and that costs the gesture nothing: he
+// tapped to send the turn he is now correcting, so the session is already up.
+// It is gated because trace ids are sequential integers and this writes the one
+// table the routing heads (V-546) will be fitted on. A caller who can guess an
+// id could otherwise mislabel turns he never corrected.
+func handleCorrectAPI(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI, session *webauthn.PasskeySession, requireStepUp bool) {
 	if r.Method != http.MethodPost {
 		http.Error(w, "POST only", http.StatusMethodNotAllowed)
 		return
@@ -143,6 +144,9 @@ func handleCorrectAPI(w http.ResponseWriter, r *http.Request, core ipc.CoreAPI)
 	if !requireCore(w, core, "correct") {
 		return
 	}
+	if !stepUpGate(w, session, requireStepUp) {
+		return
+	}
 	id, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("trace_id")), 10, 64)
 	if err != nil || id <= 0 {
 		http.Error(w, "trace_id required", http.StatusBadRequest)
diff --git a/cmd/mavweb/correct_test.go b/cmd/mavweb/correct_test.go
index 20ecd59..ef33f2d 100644
--- a/cmd/mavweb/correct_test.go
+++ b/cmd/mavweb/correct_test.go
@@ -38,7 +38,7 @@ func TestCorrectAPIWithTarget(t *testing.T) {
 	rr := httptest.NewRecorder()
 	handleCorrectAPI(rr, postCorrect(url.Values{
 		"trace_id": {"42"}, "should_be": {"fact"}, "q": {"поужинал"}, "rep": {"поняла"},
-	}), core)
+	}), core, stepUpSession(), false)
 
 	if rr.Code != http.StatusSeeOther {
 		t.Fatalf("status %d, want 303; body=%s", rr.Code, rr.Body.String())
@@ -58,7 +58,7 @@ func TestCorrectAPIWithTarget(t *testing.T) {
 func TestCorrectAPIWithNoTarget(t *testing.T) {
 	core := &correctCore{}
 	rr := httptest.NewRecorder()
-	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"7"}}), core)
+	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"7"}}), core, stepUpSession(), false)
 
 	if rr.Code != http.StatusSeeOther {
 		t.Fatalf("status %d, want 303", rr.Code)
@@ -76,7 +76,7 @@ func TestCorrectAPIWithNoTarget(t *testing.T) {
 func TestCorrectAPIRejectsUnknownTarget(t *testing.T) {
 	core := &correctCore{}
 	rr := httptest.NewRecorder()
-	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"7"}, "should_be": {"погода"}}), core)
+	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"7"}, "should_be": {"погода"}}), core, stepUpSession(), false)
 
 	if rr.Code != http.StatusBadRequest {
 		t.Fatalf("status %d, want 400", rr.Code)
@@ -90,7 +90,7 @@ func TestCorrectAPINeedsTraceID(t *testing.T) {
 	for _, form := range []url.Values{{}, {"trace_id": {"0"}}, {"trace_id": {"nope"}}} {
 		core := &correctCore{}
 		rr := httptest.NewRecorder()
-		handleCorrectAPI(rr, postCorrect(form), core)
+		handleCorrectAPI(rr, postCorrect(form), core, stepUpSession(), false)
 		if rr.Code != http.StatusBadRequest {
 			t.Errorf("form %v: status %d, want 400", form, rr.Code)
 		}
@@ -105,7 +105,7 @@ func TestCorrectAPINeedsTraceID(t *testing.T) {
 func TestCorrectAPIReportsFailure(t *testing.T) {
 	core := &correctCore{err: errors.New("disk is full")}
 	rr := httptest.NewRecorder()
-	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"9"}, "should_be": {"note"}}), core)
+	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"9"}, "should_be": {"note"}}), core, stepUpSession(), false)
 	if rr.Code != http.StatusBadGateway {
 		t.Fatalf("status %d, want 502", rr.Code)
 	}
@@ -115,7 +115,7 @@ func TestCorrectAPIReportsFailure(t *testing.T) {
 func TestCorrectAPIExpiredTurn(t *testing.T) {
 	core := &correctCore{err: ipc.ErrNoSuchTrace}
 	rr := httptest.NewRecorder()
-	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"9"}, "should_be": {"note"}}), core)
+	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"9"}, "should_be": {"note"}}), core, stepUpSession(), false)
 	if rr.Code != http.StatusNotFound {
 		t.Fatalf("status %d, want 404", rr.Code)
 	}
@@ -123,7 +123,7 @@ func TestCorrectAPIExpiredTurn(t *testing.T) {
 
 func TestCorrectAPIPostOnly(t *testing.T) {
 	rr := httptest.NewRecorder()
-	handleCorrectAPI(rr, httptest.NewRequest(http.MethodGet, "/api/correct", nil), &correctCore{})
+	handleCorrectAPI(rr, httptest.NewRequest(http.MethodGet, "/api/correct", nil), &correctCore{}, stepUpSession(), false)
 	if rr.Code != http.StatusMethodNotAllowed {
 		t.Fatalf("status %d, want 405", rr.Code)
 	}
@@ -144,3 +144,17 @@ func TestCorrectionTargetsAreTheSeven(t *testing.T) {
 		t.Error("empty is not a target: it is the absence of one, handled separately")
 	}
 }
+
+// Trace ids are sequential, so a caller who cannot assert step-up must not be
+// able to label a turn the owner never corrected.
+func TestCorrectAPINeedsStepUp(t *testing.T) {
+	core := &correctCore{}
+	rr := httptest.NewRecorder()
+	handleCorrectAPI(rr, postCorrect(url.Values{"trace_id": {"9"}, "should_be": {"note"}}), core, nil, true)
+	if rr.Code != http.StatusForbidden {
+		t.Fatalf("status %d, want 403", rr.Code)
+	}
+	if core.called {
+		t.Error("wrote a label with no step-up")
+	}
+}
diff --git a/cmd/mavweb/main.go b/cmd/mavweb/main.go
index 15fa0d9..22578cd 100644
--- a/cmd/mavweb/main.go
+++ b/cmd/mavweb/main.go
@@ -210,13 +210,7 @@ func main() {
 	mux.HandleFunc("/routines", gatedPage(handleRoutines))
 	mux.HandleFunc("/api/chat", gatedPage(handleChatAPI))
 	mux.HandleFunc("/api/revert", gatedPage(handleRevert))
-	// POST /api/correct is deliberately NOT on the step-up list (V-630). It
-	// reaches no router, no model and no act path: it writes one label row that
-	// nothing executes from. A correction that costs a passkey tap is a
-	// correction the owner does not make, and then the table stays empty.
-	mux.HandleFunc("/api/correct", func(w http.ResponseWriter, r *http.Request) {
-		handleCorrectAPI(w, r, core)
-	})
+	mux.HandleFunc("/api/correct", gatedPage(handleCorrectAPI))
 	mux.HandleFunc("/models", func(w http.ResponseWriter, r *http.Request) {
 		handleModels(w, r, core, swapConn, stepUpSession, *requireStepUp)
 	})