diff --git a/internal/auth/oidc/integration_keycloak_rotate_test.go b/internal/auth/oidc/integration_keycloak_rotate_test.go
new file mode 100644
index 0000000..169201a
--- /dev/null
+++ b/internal/auth/oidc/integration_keycloak_rotate_test.go
@@ -0,0 +1,102 @@
+//go:build integration
+
+package oidc_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/certctl-io/certctl/internal/auth/oidc/testfixtures"
+)
+
+// =============================================================================
+// Audit 2026-05-10 Nit-5 closure — Keycloak-backed integration test for
+// the MED-6 JWKS auto-refresh path.
+//
+// Distinct from integration_keycloak_test.go's existing
+// TestKeycloakIntegration_JWKSRotation_RefreshKeysPicksUpNewKey: that
+// test calls `svc.RefreshKeys` explicitly between the rotate event and
+// the second login (operator-driven path). This test deliberately does
+// NOT call RefreshKeys — it exercises the IMPLICIT auto-refresh that
+// MED-6 added inside HandleCallback's verify-error branch.
+//
+// The unit-test sibling lives in service_test.go::
+// TestService_HandleCallback_MED6_AutoRefreshOnKidMiss; it uses an
+// in-process mockIdP. Here we run against a real Keycloak realm so
+// the test pins behavior against the actual go-oidc error strings
+// emitted by a production-grade JWKS endpoint with multiple active
+// keys + a key-priority change.
+//
+// Build-tagged `integration` so it doesn't run under `make test` /
+// `go test -short`. Runs via `make keycloak-integration-test` which
+// boots the Keycloak testcontainer.
+// =============================================================================
+
+// TestKeycloakIntegration_MED6_AutoRefreshOnKidMiss pins the MED-6
+// recovery contract: after the realm rotates its signing key, the
+// next /auth/oidc/callback request that arrives WITHOUT an explicit
+// operator-initiated RefreshKeys must still succeed — HandleCallback
+// detects the kid-not-in-cache shape and runs the one-shot refresh +
+// retry internally.
+//
+// Plan:
+//  1. Successful baseline login under the realm's original signing key
+//     (primes the certctl service's JWKS cache).
+//  2. Rotate the realm's RSA key via the Keycloak admin API.
+//  3. Run a fresh /auth/oidc/login → /auth/oidc/callback flow.
+//     - Keycloak signs the new ID token under the new (higher-priority)
+//       key.
+//     - certctl's verifier holds the pre-rotate JWKS in cache.
+//     - The verify trips kid-not-in-cache → MED-6 auto-refresh fires →
+//       second verify succeeds.
+//  4. Assert the callback succeeded without the test having called
+//     RefreshKeys (which would mask the MED-6 path).
+//
+// Note: this is the Keycloak-against-real-IdP variant of MED-6's
+// unit test. The unit test stays the canonical regression because
+// it doesn't require the testcontainer; this test is the
+// belt-and-braces check that the auto-refresh works against real
+// go-oidc error wording emitted by a production-grade JWKS endpoint.
+func TestKeycloakIntegration_MED6_AutoRefreshOnKidMiss(t *testing.T) {
+	fx := keycloakFor(t)
+	svc, _, _, _ := buildKeycloakService(t, fx, map[string]string{
+		testfixtures.EngineerGroup: "r-operator",
+	})
+
+	ctx, cancel := context.WithTimeout(context.Background(), 90*time.Second)
+	defer cancel()
+
+	// Step 1 — baseline login to prime the JWKS cache.
+	preAuthURL, preCookie, _, err := svc.HandleAuthRequest(ctx, fx.Provider.ID, "", "")
+	if err != nil {
+		t.Fatalf("pre-rotate HandleAuthRequest: %v", err)
+	}
+	preCode, preState := driveAuthCodeFlow(t, preAuthURL, testfixtures.EngineerUser, testfixtures.EngineerPassword)
+	if _, err := svc.HandleCallback(ctx, preCookie, preCode, preState, "", "ip", "ua"); err != nil {
+		t.Fatalf("pre-rotate HandleCallback (priming): %v", err)
+	}
+
+	// Step 2 — rotate Keycloak's realm signing key.
+	fx.RotateRealmKeys(t)
+
+	// Step 3 — DELIBERATELY skip svc.RefreshKeys. The whole point of
+	// MED-6 is that the implicit auto-refresh inside HandleCallback
+	// recovers from kid-not-in-cache without operator intervention.
+	// If MED-6 regressed, the callback below would fail with a
+	// generic verify error or ErrJWKSUnreachable.
+
+	// Step 4 — post-rotate login through the implicit recovery path.
+	postAuthURL, postCookie, _, err := svc.HandleAuthRequest(ctx, fx.Provider.ID, "", "")
+	if err != nil {
+		t.Fatalf("post-rotate HandleAuthRequest: %v", err)
+	}
+	postCode, postState := driveAuthCodeFlow(t, postAuthURL, testfixtures.EngineerUser, testfixtures.EngineerPassword)
+	res, err := svc.HandleCallback(ctx, postCookie, postCode, postState, "", "ip", "ua")
+	if err != nil {
+		t.Fatalf("post-rotate HandleCallback (expected MED-6 auto-refresh): %v", err)
+	}
+	if res == nil || res.User == nil {
+		t.Fatalf("CallbackResult missing user after MED-6 recovery")
+	}
+}
diff --git a/internal/auth/oidc/integration_keycloak_test.go b/internal/auth/oidc/integration_keycloak_test.go
index 1139177..e06cc24 100644
--- a/internal/auth/oidc/integration_keycloak_test.go
+++ b/internal/auth/oidc/integration_keycloak_test.go
@@ -203,23 +203,27 @@ func (s *itestSessionMinter) Revoke(cookieValue string) {
 type itestPreLogin struct {
 	rows map[string]itestPreLoginRow
 }
-type itestPreLoginRow struct{ providerID, state, nonce, verifier string }
+type itestPreLoginRow struct {
+	providerID, state, nonce, verifier string
+	// Audit 2026-05-10 MED-16 — UA/IP binding capture.
+	clientIP, userAgent string
+}
 
 func newItestPreLogin() *itestPreLogin {
 	return &itestPreLogin{rows: make(map[string]itestPreLoginRow)}
 }
-func (s *itestPreLogin) CreatePreLogin(_ context.Context, providerID, state, nonce, verifier string) (string, string, error) {
+func (s *itestPreLogin) CreatePreLogin(_ context.Context, providerID, state, nonce, verifier, clientIP, userAgent string) (string, string, error) {
 	cookieVal := fmt.Sprintf("pl-keycloak-itest-%d", len(s.rows)+1)
-	s.rows[cookieVal] = itestPreLoginRow{providerID, state, nonce, verifier}
+	s.rows[cookieVal] = itestPreLoginRow{providerID, state, nonce, verifier, clientIP, userAgent}
 	return cookieVal, "ses-" + cookieVal, nil
 }
-func (s *itestPreLogin) LookupAndConsume(_ context.Context, cookie string) (string, string, string, string, error) {
+func (s *itestPreLogin) LookupAndConsume(_ context.Context, cookie string) (string, string, string, string, string, string, error) {
 	r, ok := s.rows[cookie]
 	if !ok {
-		return "", "", "", "", oidc.ErrPreLoginNotFound
+		return "", "", "", "", "", "", oidc.ErrPreLoginNotFound
 	}
 	delete(s.rows, cookie)
-	return r.providerID, r.state, r.nonce, r.verifier, nil
+	return r.providerID, r.state, r.nonce, r.verifier, r.clientIP, r.userAgent, nil
 }
 
 // ---------------------------------------------------------------------------