diff --git a/enterprise/coderd/groups.go b/enterprise/coderd/groups.go
index 24589dd5cd8..8103b4018ca 100644
--- a/enterprise/coderd/groups.go
+++ b/enterprise/coderd/groups.go
@@ -285,9 +285,15 @@ func (api *API) patchGroup(rw http.ResponseWriter, r *http.Request) {
 		})
 		return
 	}
+	// Unauthorized errors return a 404 to not leak information about the
+	// existence of resources.
+	if httpapi.IsUnauthorizedError(err) {
+		httpapi.ResourceNotFound(rw)
+		return
+	}
 	if httpapi.Is404Error(err) {
 		httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
-			Message: "Failed to add or remove non-existent group member",
+			Message: "Failed to update group.",
 			Detail:  err.Error(),
 		})
 		return
diff --git a/enterprise/coderd/groups_test.go b/enterprise/coderd/groups_test.go
index ae1dee58350..946bc30cd55 100644
--- a/enterprise/coderd/groups_test.go
+++ b/enterprise/coderd/groups_test.go
@@ -420,6 +420,52 @@ func TestPatchGroup(t *testing.T) {
 		require.Equal(t, http.StatusBadRequest, cerr.StatusCode())
 	})
 
+	// A group member can read the group but must not be able to update it.
+	// The update must be rejected as an authorization failure that returns a
+	// 404 to not leak resource existence.
+	t.Run("MemberWithoutUpdatePermission", func(t *testing.T) {
+		t.Parallel()
+
+		client, user := coderdenttest.New(t, &coderdenttest.Options{LicenseOptions: &coderdenttest.LicenseOptions{
+			Features: license.Features{
+				codersdk.FeatureTemplateRBAC: 1,
+			},
+		}})
+		userAdminClient, _ := coderdtest.CreateAnotherUser(t, client, user.OrganizationID, rbac.RoleUserAdmin())
+		memberClient, member := coderdtest.CreateAnotherUser(t, client, user.OrganizationID)
+		ctx := testutil.Context(t, testutil.WaitLong)
+
+		group, err := userAdminClient.CreateGroup(ctx, user.OrganizationID, codersdk.CreateGroupRequest{
+			Name: "hi",
+		})
+		require.NoError(t, err)
+
+		// Make the actor a member of the group so it can read the group but
+		// still lacks group:update.
+		_, err = userAdminClient.PatchGroup(ctx, group.ID, codersdk.PatchGroupRequest{
+			AddUsers: []string{member.ID.String()},
+		})
+		require.NoError(t, err)
+
+		// Updating the group budget must fail as unauthorized (404).
+		_, err = memberClient.PatchGroup(ctx, group.ID, codersdk.PatchGroupRequest{
+			QuotaAllowance: ptr.Ref(20),
+		})
+		require.Error(t, err)
+		cerr, ok := codersdk.AsError(err)
+		require.True(t, ok)
+		require.Equal(t, http.StatusNotFound, cerr.StatusCode())
+
+		// Adding a member must also fail as unauthorized (404).
+		_, err = memberClient.PatchGroup(ctx, group.ID, codersdk.PatchGroupRequest{
+			AddUsers: []string{user.UserID.String()},
+		})
+		require.Error(t, err)
+		cerr, ok = codersdk.AsError(err)
+		require.True(t, ok)
+		require.Equal(t, http.StatusNotFound, cerr.StatusCode())
+	})
+
 	t.Run("MalformedUUID", func(t *testing.T) {
 		t.Parallel()
 
diff --git a/site/src/pages/GroupsPage/GroupPage.stories.tsx b/site/src/pages/GroupsPage/GroupPage.stories.tsx
index 6d8df2f5641..023d03f2777 100644
--- a/site/src/pages/GroupsPage/GroupPage.stories.tsx
+++ b/site/src/pages/GroupsPage/GroupPage.stories.tsx
@@ -43,6 +43,7 @@ import {
 } from "#/testHelpers/storybook";
 import GroupMembersPage from "./GroupMembersPage";
 import GroupPage from "./GroupPage";
+import GroupSettingsPage from "./GroupSettingsPage";
 
 const meta: Meta<typeof GroupPage> = {
 	title: "pages/OrganizationGroupsPage/GroupPage",
@@ -208,6 +209,47 @@ export const NoUpdatePermission: Story = {
 	},
 };
 
+/**
+ * The settings page is reachable by direct URL even when the settings tab is
+ * hidden. Without group:update, it must render the permission dialog instead
+ * of the editable form.
+ */
+export const SettingsWithoutUpdatePermission: Story = {
+	parameters: {
+		reactRouter: reactRouterParameters({
+			location: {
+				pathParams: {
+					organization: MockDefaultOrganization.name,
+					groupName: MockGroupWithoutMembers.name,
+				},
+			},
+			routing: reactRouterOutlet(
+				{ path: "/organizations/:organization/groups/:groupName/settings" },
+				<GroupSettingsPage />,
+			),
+		}),
+		queries: [
+			groupQuery(MockGroupWithoutMembers),
+			groupMembersQuery({
+				users: MockGroup.members,
+				count: MockGroup.members.length,
+			}),
+			permissionsQuery({ canUpdateGroup: false }),
+		],
+	},
+	play: async ({ canvasElement }) => {
+		const body = within(document.body);
+		await expect(
+			await body.findByText("You don't have permission to view this page"),
+		).toBeInTheDocument();
+		// The editable budget/name form is never rendered.
+		const canvas = within(canvasElement);
+		expect(
+			canvas.queryByRole("button", { name: "Save" }),
+		).not.toBeInTheDocument();
+	},
+};
+
 export const EveryoneGroup: Story = {
 	parameters: {
 		queries: [
diff --git a/site/src/pages/GroupsPage/GroupSettingsPage.tsx b/site/src/pages/GroupsPage/GroupSettingsPage.tsx
index e7f5d29359a..25186e10daf 100644
--- a/site/src/pages/GroupsPage/GroupSettingsPage.tsx
+++ b/site/src/pages/GroupsPage/GroupSettingsPage.tsx
@@ -11,6 +11,7 @@ import {
 import { ErrorAlert } from "#/components/Alert/ErrorAlert";
 import { Spinner } from "#/components/Spinner/Spinner";
 import { useFeatureVisibility } from "#/modules/dashboard/useFeatureVisibility";
+import { RequirePermission } from "#/modules/permissions/RequirePermission";
 import { dollarsToMicros, microsToDollars } from "#/utils/currency";
 import type { GroupPageOutletContext } from "./GroupPage";
 import GroupSettingsPageView from "./GroupSettingsPageView";
@@ -23,20 +24,26 @@ const GroupSettingsPage: FC = () => {
 		organization?: string;
 		groupName: string;
 	};
-	const { group: groupData } = useOutletContext<GroupPageOutletContext>();
+	const { group: groupData, permissions } =
+		useOutletContext<GroupPageOutletContext>();
 	const queryClient = useQueryClient();
 	const patchGroupMutation = useMutation(patchGroup(queryClient, organization));
 	const navigate = useNavigate();
 
 	const aibridgeVisible = Boolean(useFeatureVisibility().aibridge);
+	const canUpdateGroup = permissions.canUpdateGroup;
 	const budgetQuery = useQuery({
 		...groupAIBudget(groupData.id),
-		enabled: aibridgeVisible,
+		enabled: aibridgeVisible && canUpdateGroup,
 	});
 	const saveBudgetMutation = useMutation(
 		saveGroupAIBudget(queryClient, groupData.id),
 	);
 
+	if (!canUpdateGroup) {
+		return <RequirePermission isFeatureVisible={false} />;
+	}
+
 	if (aibridgeVisible && budgetQuery.isLoading) {
 		return (
 			<div className="flex items-center justify-center p-10">