diff --git a/backend/ruoyi-admin/src/main/java/org/dromara/web/service/impl/SmsAuthStrategy.java b/backend/ruoyi-admin/src/main/java/org/dromara/web/service/impl/SmsAuthStrategy.java
index db5dbee8..f4d144ef 100644
--- a/backend/ruoyi-admin/src/main/java/org/dromara/web/service/impl/SmsAuthStrategy.java
+++ b/backend/ruoyi-admin/src/main/java/org/dromara/web/service/impl/SmsAuthStrategy.java
@@ -89,7 +89,9 @@ public class SmsAuthStrategy implements IAuthStrategy {
     }
 
     private SysUserVo loadOrRegisterUserByPhonenumber(String tenantId, String phonenumber) {
-        SysUserVo user = userMapper.selectVoOne(new LambdaQueryWrapper<SysUser>().eq(SysUser::getPhonenumber, phonenumber));
+        SysUserVo user = userMapper.selectVoOne(new LambdaQueryWrapper<SysUser>()
+            .eq(SysUser::getTenantId, tenantId)
+            .eq(SysUser::getPhonenumber, phonenumber));
         if (ObjectUtil.isNull(user)) {
             SysUser sysUser = new SysUser();
             sysUser.setTenantId(tenantId);
diff --git a/backend/ruoyi-admin/src/test/java/org/dromara/web/service/impl/SmsAuthStrategyTenantTest.java b/backend/ruoyi-admin/src/test/java/org/dromara/web/service/impl/SmsAuthStrategyTenantTest.java
new file mode 100644
index 00000000..3268812e
--- /dev/null
+++ b/backend/ruoyi-admin/src/test/java/org/dromara/web/service/impl/SmsAuthStrategyTenantTest.java
@@ -0,0 +1,25 @@
+package org.dromara.web.service.impl;
+
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@Tag("dev")
+class SmsAuthStrategyTenantTest {
+
+    @Test
+    void mobileSmsUserLookupKeepsTenantBoundary() throws Exception {
+        Path source = Path.of("src/main/java/org/dromara/web/service/impl/SmsAuthStrategy.java");
+        if (!Files.exists(source)) {
+            source = Path.of("ruoyi-admin/src/main/java/org/dromara/web/service/impl/SmsAuthStrategy.java");
+        }
+        String code = Files.readString(source);
+
+        assertTrue(code.contains(".eq(SysUser::getTenantId, tenantId)"));
+        assertTrue(code.contains(".eq(SysUser::getPhonenumber, phonenumber)"));
+    }
+}
diff --git a/docs/BRD_IMPLEMENTATION_AUDIT.md b/docs/BRD_IMPLEMENTATION_AUDIT.md
index 73e95ad0..5f776eac 100644
--- a/docs/BRD_IMPLEMENTATION_AUDIT.md
+++ b/docs/BRD_IMPLEMENTATION_AUDIT.md
@@ -101,3 +101,4 @@
 - 2026-07-14 目录导入异步任务租户边界修复：`startLocalImportTask` 捕获当前租户，并用 `TenantHelper.dynamic` 包住整个后台导入 worker，任务进度、取消状态、OSS/片段/向量写入不再因脱离登录线程回退到 `000000`；新增异步上下文回归测试。正式多租户目录导入仍需测试环境验证。
 - 2026-07-14 线上只读复核：生产根站点、`/h5/`、租户列表和员工首页 API 均返回 200；线上仍加载管理端 `index-CJZ3Ax3Z.js` 与 H5 `index-D4-NrEpb.js`，本地最新租户边界修复提交 `6ec17726`、`c95cb1ff` 尚未发布。本次未修改生产环境，发布前需先做测试环境跨租户上传/目录导入回归。
 - 2026-07-14 异步队列清扫修复：上传队列 worker 的卡死任务清扫改为跨租户扫描，避免无登录线程回退到 `000000` 后只清理默认租户；实际加工、失败回写和 SOP 处理仍按队列条目租户隔离。`AihrUploadQueueServiceTest` 与 AIHR 全量测试 51/51 通过；双租户上传/目录导入仍需测试环境回归。
+- 2026-07-14 移动端短信登录租户修复：手机号查询补充 `tenant_id` 条件，避免同一手机号在不同租户登录时复用其他租户的 `sys_user`；新增认证策略边界回归测试。正式多租户登录仍需用测试租户账号做 HTTP 回归。