diff --git a/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/ConfirmDeleteModal.razor b/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/ConfirmDeleteModal.razor
index ebb507f..c4f2631 100644
--- a/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/ConfirmDeleteModal.razor
+++ b/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/ConfirmDeleteModal.razor
@@ -81,6 +81,12 @@
     private async Task ConfirmAsync()
     {
         _error = null;
+
+        if (!await SecretsComponentAuthorization.IsAuthorizedAsync(Services, AuthState, SecretsAuthorization.ManagePolicy))
+        {
+            _error = "You are not authorized to delete secrets.";
+            return;
+        }
         _busy = true;
         bool deleted = false;
         try
diff --git a/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/RevealButton.razor b/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/RevealButton.razor
index e28541d..0a26908 100644
--- a/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/RevealButton.razor
+++ b/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/RevealButton.razor
@@ -56,6 +56,14 @@ else
     // value costs only a retry.
     private async Task RevealAsync()
     {
+        if (!await SecretsComponentAuthorization.IsAuthorizedAsync(Services, AuthState, SecretsAuthorization.RevealPolicy))
+        {
+            _value = null;
+            _error = "You are not authorized to reveal secrets.";
+            _revealed = true;
+            return;
+        }
+
         _busy = true;
         // Captured now: if the component is disposed mid-reveal, reading _cts.Token later would throw
         // ObjectDisposedException; a captured token just reports cancellation, which fails closed.
diff --git a/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/SecretEditor.razor b/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/SecretEditor.razor
index 9a9e497..541dad6 100644
--- a/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/SecretEditor.razor
+++ b/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/Components/SecretEditor.razor
@@ -110,6 +110,12 @@
     {
         _error = null;
 
+        if (!await SecretsComponentAuthorization.IsAuthorizedAsync(Services, AuthState, SecretsAuthorization.ManagePolicy))
+        {
+            _error = "You are not authorized to manage secrets.";
+            return;
+        }
+
         SecretName name;
         try
         {
diff --git a/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/SecretsComponentAuthorization.cs b/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/SecretsComponentAuthorization.cs
new file mode 100644
index 0000000..f5f6fac
--- /dev/null
+++ b/ZB.MOM.WW.Secrets/src/ZB.MOM.WW.Secrets.Ui/SecretsComponentAuthorization.cs
@@ -0,0 +1,38 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Components.Authorization;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace ZB.MOM.WW.Secrets.Ui;
+
+/// <summary>
+/// The in-component policy check every revealing or mutating handler runs before it touches the
+/// store (Secrets-016). The public components used to rely entirely on the host rendering them
+/// inside an <c>AuthorizeView</c>; a host that composed <c>&lt;RevealButton/&gt;</c> into a
+/// lower-privilege page handed plaintext to anyone who could see that page. Now each component
+/// re-checks its own policy and fails closed — no authentication state, no
+/// <see cref="IAuthorizationService"/>, or a failed policy all refuse.
+/// </summary>
+internal static class SecretsComponentAuthorization
+{
+    public static async Task<bool> IsAuthorizedAsync(
+        IServiceProvider services, Task<AuthenticationState>? cascadedState, string policy)
+    {
+        IAuthorizationService? authorization = services.GetService<IAuthorizationService>();
+        if (authorization is null)
+        {
+            return false;
+        }
+
+        Task<AuthenticationState>? stateTask = cascadedState
+            ?? services.GetService<AuthenticationStateProvider>()?.GetAuthenticationStateAsync();
+        if (stateTask is null)
+        {
+            return false;
+        }
+
+        AuthenticationState state = await stateTask.ConfigureAwait(false);
+        AuthorizationResult result = await authorization.AuthorizeAsync(state.User, resource: null, policy)
+            .ConfigureAwait(false);
+        return result.Succeeded;
+    }
+}
diff --git a/ZB.MOM.WW.Secrets/tests/ZB.MOM.WW.Secrets.Ui.Tests/ComponentAuthorizationTests.cs b/ZB.MOM.WW.Secrets/tests/ZB.MOM.WW.Secrets.Ui.Tests/ComponentAuthorizationTests.cs
new file mode 100644
index 0000000..c2904de
--- /dev/null
+++ b/ZB.MOM.WW.Secrets/tests/ZB.MOM.WW.Secrets.Ui.Tests/ComponentAuthorizationTests.cs
@@ -0,0 +1,160 @@
+using System.Security.Claims;
+using Bunit;
+using Bunit.TestDoubles;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.Extensions.DependencyInjection;
+using ZB.MOM.WW.Audit;
+using ZB.MOM.WW.Auth.AspNetCore;
+using ZB.MOM.WW.Secrets.Abstractions;
+using ZB.MOM.WW.Secrets.Ui.Components;
+using ZB.MOM.WW.Secrets.Ui.Tests.Fakes;
+
+namespace ZB.MOM.WW.Secrets.Ui.Tests;
+
+/// <summary>
+/// Secrets-016: each public component re-checks its own policy, so a host that renders one outside
+/// an <c>AuthorizeView</c> cannot hand its action to a user without the right; and the REAL policy
+/// definitions in <see cref="SecretsAuthorization.AddSecretsAuthorization"/> are pinned (the bUnit
+/// tests elsewhere use <c>SetPolicies</c>, which bypasses them).
+/// </summary>
+public class ComponentAuthorizationTests : TestContext
+{
+    private const string PlainValue = "the-plaintext-value-42";
+
+    private (RecordingSecretStore Store, CapturingAuditWriter Audit, FakeCipher Cipher) Setup(params string[] grantedPolicies)
+    {
+        var store = new RecordingSecretStore();
+        var audit = new CapturingAuditWriter();
+        var cipher = new FakeCipher();
+        Services.AddSingleton<ISecretStore>(store);
+        Services.AddSingleton<IAuditWriter>(audit);
+        Services.AddSingleton<ISecretCipher>(cipher);
+        var auth = this.AddTestAuthorization();
+        auth.SetAuthorized("eve");
+        auth.SetPolicies(grantedPolicies);
+        return (store, audit, cipher);
+    }
+
+    [Fact]
+    public void RevealButton_outside_an_AuthorizeView_refuses_a_manager_without_reveal()
+    {
+        // A host composed the button into a page gated only by ManagePolicy.
+        var (store, audit, cipher) = Setup(SecretsAuthorization.ManagePolicy);
+        var name = new SecretName("prod/db");
+        store.Seed(cipher.Encrypt(name, PlainValue, SecretContentType.Text) with
+        {
+            Revision = 1, CreatedUtc = DateTimeOffset.UnixEpoch, UpdatedUtc = DateTimeOffset.UnixEpoch,
+        });
+
+        var cut = RenderComponent<RevealButton>(p => p.Add(c => c.Name, name));
+        cut.Find("button.reveal-secret").Click();
+
+        Assert.DoesNotContain(PlainValue, cut.Markup);
+        Assert.Contains("not authorized", cut.Find("[data-testid=reveal-error]").TextContent);
+        Assert.DoesNotContain(audit.Events, e => e.Outcome == AuditOutcome.Success);
+    }
+
+    [Fact]
+    public void RevealButton_still_reveals_for_a_holder_of_the_reveal_policy()
+    {
+        var (store, _, cipher) = Setup(SecretsAuthorization.RevealPolicy);
+        var name = new SecretName("prod/db");
+        store.Seed(cipher.Encrypt(name, PlainValue, SecretContentType.Text) with
+        {
+            Revision = 1, CreatedUtc = DateTimeOffset.UnixEpoch, UpdatedUtc = DateTimeOffset.UnixEpoch,
+        });
+
+        var cut = RenderComponent<RevealButton>(p => p.Add(c => c.Name, name));
+        cut.Find("button.reveal-secret").Click();
+
+        Assert.Contains(PlainValue, cut.Markup);
+    }
+
+    [Fact]
+    public void SecretEditor_refuses_a_user_without_the_manage_policy()
+    {
+        var (store, audit, _) = Setup(/* no policies */);
+
+        var cut = RenderComponent<SecretEditor>(p => p.Add(c => c.OnSaved, () => { }));
+        cut.Find("[data-testid=secret-name]").Change("app/thing");
+        cut.Find("[data-testid=secret-value]").Change("v");
+        cut.Find("[data-testid=editor-submit]").Click();
+
+        Assert.Empty(store.Upserts);
+        Assert.Empty(audit.Events);
+        Assert.Contains("not authorized", cut.Find("[data-testid=editor-error]").TextContent);
+    }
+
+    [Fact]
+    public void ConfirmDeleteModal_refuses_a_user_without_the_manage_policy()
+    {
+        var (store, _, cipher) = Setup(/* no policies */);
+        var name = new SecretName("app/thing");
+        store.Seed(cipher.Encrypt(name, "v", SecretContentType.Text) with
+        {
+            Revision = 1, CreatedUtc = DateTimeOffset.UnixEpoch, UpdatedUtc = DateTimeOffset.UnixEpoch,
+        });
+        bool deleted = false;
+
+        var cut = RenderComponent<ConfirmDeleteModal>(p => p
+            .Add(c => c.Visible, true)
+            .Add(c => c.Name, name)
+            .Add(c => c.OnDeleted, () => deleted = true));
+        cut.Find("[data-testid=confirm-delete]").Click();
+
+        Assert.Empty(store.Deletes);
+        Assert.False(deleted);
+    }
+
+    // ---------- the real policy definitions ----------
+
+    public static TheoryData<string?, bool, bool> RoleMatrix => new()
+    {
+        // role, satisfies ManagePolicy, satisfies RevealPolicy
+        { SecretsAuthorization.ManageRole, true, false },
+        { SecretsAuthorization.RevealRole, true, true },
+        { SecretsAuthorization.AdminRole, true, true },
+        { "Viewer", false, false },
+        { null, false, false },
+    };
+
+    [Theory]
+    [MemberData(nameof(RoleMatrix))]
+    public async Task The_policy_definitions_grant_exactly_the_documented_roles(string? role, bool manage, bool reveal)
+    {
+        var services = new ServiceCollection();
+        services.AddLogging();
+        services.AddAuthorization(o => o.AddSecretsAuthorization());
+        await using ServiceProvider sp = services.BuildServiceProvider();
+        var authorization = sp.GetRequiredService<IAuthorizationService>();
+
+        var claims = new List<Claim> { new(ClaimTypes.Name, "u") };
+        if (role is not null)
+        {
+            claims.Add(new Claim(ZbClaimTypes.Role, role));
+        }
+
+        var user = new ClaimsPrincipal(new ClaimsIdentity(claims, "test", ClaimTypes.Name, ZbClaimTypes.Role));
+
+        Assert.Equal(manage, (await authorization.AuthorizeAsync(user, SecretsAuthorization.ManagePolicy)).Succeeded);
+        Assert.Equal(reveal, (await authorization.AuthorizeAsync(user, SecretsAuthorization.RevealPolicy)).Succeeded);
+    }
+
+    [Fact]
+    public async Task An_unauthenticated_principal_satisfies_neither_policy_even_with_the_role_claim()
+    {
+        var services = new ServiceCollection();
+        services.AddLogging();
+        services.AddAuthorization(o => o.AddSecretsAuthorization());
+        await using ServiceProvider sp = services.BuildServiceProvider();
+        var authorization = sp.GetRequiredService<IAuthorizationService>();
+
+        // No authentication type -> IsAuthenticated == false.
+        var user = new ClaimsPrincipal(new ClaimsIdentity(
+            [new Claim(ZbClaimTypes.Role, SecretsAuthorization.AdminRole)], authenticationType: null,
+            ClaimTypes.Name, ZbClaimTypes.Role));
+
+        Assert.False((await authorization.AuthorizeAsync(user, SecretsAuthorization.ManagePolicy)).Succeeded);
+        Assert.False((await authorization.AuthorizeAsync(user, SecretsAuthorization.RevealPolicy)).Succeeded);
+    }
+}