diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84b7bf1..1bec7b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- RLS-Migration fuer tenant-bezogene Tabellen mit Membership-basierten Policies angelegt.
 - Audit-Log-Migration mit append-only Triggern und Tenant-Zeit-Index angelegt.
 - VMID-Allokator-Migration mit transaktionssicherer Reservation pro Cluster angelegt.
 - VMs-und-SSH-Keys-Migration mit Ressourcen-Mapping und eindeutigem Proxmox-VMID-Index angelegt.
diff --git a/TODO.md b/TODO.md
index 8f5b7cc..00358f6 100644
--- a/TODO.md
+++ b/TODO.md
@@ -64,6 +64,11 @@ Arbeitsliste auf Basis von `proxmox-console-entwicklungsplan.md`. Die Entwurfsda
   - [x] Tenant- und Profil-Referenzen gesetzt
   - [x] Index auf `(tenant_id, created_at)` gesetzt
   - [x] UPDATE/DELETE per Trigger blockiert
+- [x] E2-T08: RLS-Policies
+  - [x] RLS auf tenant-bezogenen Tabellen aktiviert
+  - [x] Membership-basierte SELECT-Policies angelegt
+  - [x] Audit-Log auf owner/admin beschraenkt
+  - [x] Direkter Query als Nicht-Mitglied lokal verifiziert
 
 ## MVP-Backlog
 
@@ -109,3 +114,4 @@ Arbeitsliste auf Basis von `proxmox-console-entwicklungsplan.md`. Die Entwurfsda
 - 2026-06-10: VMs-und-SSH-Keys-Migration `0005_vms_and_ssh_keys` angelegt und lokal gegen Supabase verifiziert.
 - 2026-06-10: VMID-Allokator-Migration `0006_vmid_allocator` angelegt und mit 50 parallelen Reservierungen lokal gegen Supabase verifiziert.
 - 2026-06-10: Audit-Log-Migration `0007_audit_log` angelegt und Append-only-Verhalten lokal gegen Supabase verifiziert.
+- 2026-06-10: RLS-Migration `0008_rls_policies` angelegt und Mitglied/Nicht-Mitglied-Isolation lokal gegen Supabase verifiziert.
diff --git a/migrations/0008_rls_policies.down.sql b/migrations/0008_rls_policies.down.sql
new file mode 100644
index 0000000..81b58d5
--- /dev/null
+++ b/migrations/0008_rls_policies.down.sql
@@ -0,0 +1,19 @@
+DROP POLICY IF EXISTS audit_log_admin_select ON public.audit_log;
+DROP POLICY IF EXISTS ssh_keys_member_select ON public.ssh_keys;
+DROP POLICY IF EXISTS vms_member_select ON public.vms;
+DROP POLICY IF EXISTS project_quotas_member_select ON public.project_quotas;
+DROP POLICY IF EXISTS projects_member_select ON public.projects;
+DROP POLICY IF EXISTS memberships_member_select ON public.memberships;
+DROP POLICY IF EXISTS tenants_member_select ON public.tenants;
+
+ALTER TABLE public.audit_log DISABLE ROW LEVEL SECURITY;
+ALTER TABLE public.ssh_keys DISABLE ROW LEVEL SECURITY;
+ALTER TABLE public.vms DISABLE ROW LEVEL SECURITY;
+ALTER TABLE public.project_quotas DISABLE ROW LEVEL SECURITY;
+ALTER TABLE public.projects DISABLE ROW LEVEL SECURITY;
+ALTER TABLE public.memberships DISABLE ROW LEVEL SECURITY;
+ALTER TABLE public.tenants DISABLE ROW LEVEL SECURITY;
+
+DROP FUNCTION IF EXISTS public.has_tenant_role(uuid, public.membership_role[]);
+DROP FUNCTION IF EXISTS public.is_tenant_member(uuid);
+DROP FUNCTION IF EXISTS public.current_profile_id();
diff --git a/migrations/0008_rls_policies.up.sql b/migrations/0008_rls_policies.up.sql
new file mode 100644
index 0000000..f147ec4
--- /dev/null
+++ b/migrations/0008_rls_policies.up.sql
@@ -0,0 +1,95 @@
+CREATE OR REPLACE FUNCTION public.current_profile_id()
+RETURNS uuid
+LANGUAGE sql
+STABLE
+AS $$
+	SELECT nullif(current_setting('request.jwt.claim.sub', true), '')::uuid;
+$$;
+
+CREATE OR REPLACE FUNCTION public.is_tenant_member(p_tenant_id uuid)
+RETURNS boolean
+LANGUAGE sql
+STABLE
+SECURITY DEFINER
+SET search_path = public
+AS $$
+	SELECT EXISTS (
+		SELECT 1
+		FROM public.memberships
+		WHERE tenant_id = p_tenant_id
+			AND profile_id = public.current_profile_id()
+	);
+$$;
+
+CREATE OR REPLACE FUNCTION public.has_tenant_role(p_tenant_id uuid, p_roles public.membership_role[])
+RETURNS boolean
+LANGUAGE sql
+STABLE
+SECURITY DEFINER
+SET search_path = public
+AS $$
+	SELECT EXISTS (
+		SELECT 1
+		FROM public.memberships
+		WHERE tenant_id = p_tenant_id
+			AND profile_id = public.current_profile_id()
+			AND role = ANY (p_roles)
+	);
+$$;
+
+ALTER TABLE public.tenants ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.memberships ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.projects ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.project_quotas ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.vms ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.ssh_keys ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.audit_log ENABLE ROW LEVEL SECURITY;
+
+CREATE POLICY tenants_member_select
+	ON public.tenants
+	FOR SELECT
+	USING (public.is_tenant_member(id));
+
+CREATE POLICY memberships_member_select
+	ON public.memberships
+	FOR SELECT
+	USING (public.is_tenant_member(tenant_id));
+
+CREATE POLICY projects_member_select
+	ON public.projects
+	FOR SELECT
+	USING (public.is_tenant_member(tenant_id));
+
+CREATE POLICY project_quotas_member_select
+	ON public.project_quotas
+	FOR SELECT
+	USING (
+		EXISTS (
+			SELECT 1
+			FROM public.projects
+			WHERE projects.id = project_quotas.project_id
+				AND public.is_tenant_member(projects.tenant_id)
+		)
+	);
+
+CREATE POLICY vms_member_select
+	ON public.vms
+	FOR SELECT
+	USING (
+		EXISTS (
+			SELECT 1
+			FROM public.projects
+			WHERE projects.id = vms.project_id
+				AND public.is_tenant_member(projects.tenant_id)
+		)
+	);
+
+CREATE POLICY ssh_keys_member_select
+	ON public.ssh_keys
+	FOR SELECT
+	USING (public.is_tenant_member(tenant_id));
+
+CREATE POLICY audit_log_admin_select
+	ON public.audit_log
+	FOR SELECT
+	USING (public.has_tenant_role(tenant_id, ARRAY['owner', 'admin']::public.membership_role[]));