diff --git a/uniCloud-tcb/cloudfunctions/router/middleware/modules/fixEmptyDcloudAppid.js b/uniCloud-tcb/cloudfunctions/router/middleware/modules/fixEmptyDcloudAppid.js
new file mode 100644
index 0000000..cf75247
--- /dev/null
+++ b/uniCloud-tcb/cloudfunctions/router/middleware/modules/fixEmptyDcloudAppid.js
@@ -0,0 +1,49 @@
+/**
+ * 登录前修复 dcloud_appid 为空数组的用户
+ * uni-id 只放行「字段不存在」或「数组包含当前 appid」的账号，空数组会被当成用户不存在
+ */
+
+const LOGIN_APP_IDS = ["__UNI__EB80D26", "__UNI__8BFD66E", "__UNI__0F0703D"];
+
+function normalizeAccount(value) {
+	if (typeof value === "number") return String(value).trim();
+	if (typeof value === "string") return value.trim();
+	return "";
+}
+
+module.exports = [{
+	id: "fixEmptyDcloudAppid",
+	regExp: [
+		"^user/pub/login(.*)"
+	],
+	description: "登录前把 dcloud_appid 为空数组的用户补上三个应用的 appid",
+	index: 201,
+	mode: "onActionExecuting",
+	enable: true,
+	main: async function(event) {
+		let { data = {}, util } = event;
+		let { db, _ } = util;
+		const username = normalizeAccount(data.username);
+		const mobile = normalizeAccount(data.mobile);
+		const email = normalizeAccount(data.email);
+		const whereList = [];
+		if (username) {
+			whereList.push({ username }, { mobile: username }, { email: username });
+		}
+		if (mobile && mobile !== username) whereList.push({ mobile });
+		if (email && email !== username) whereList.push({ email });
+		if (whereList.length === 0) return { code: 0 };
+
+		const whereJson = whereList.length === 1 ? whereList[0] : _.or(whereList);
+		const userRes = await db.collection("uni-id-users").where(whereJson).field({
+			dcloud_appid: true
+		}).limit(10).get();
+		const users = (userRes.data || []).filter(user => Array.isArray(user.dcloud_appid) && user.dcloud_appid.length === 0);
+		for (let i = 0; i < users.length; i++) {
+			await db.collection("uni-id-users").doc(users[i]._id).update({
+				dcloud_appid: LOGIN_APP_IDS
+			});
+		}
+		return { code: 0 };
+	}
+}]