backend-spring/src/main/java/com/erp/controller/DepartmentController.java

@@ -18,6 +18,9 @@ public class DepartmentController {
 
     private final DepartmentService departmentService;
 
+    private static final java.util.regex.Pattern ISO_DATE_PATTERN =
+        java.util.regex.Pattern.compile("\\d{4}-\\d{2}-\\d{2}");
+
     /**
      * 부서 목록 조회 (회사별).
      * 기본은 active 부서만. ?include_deleted=true 시 soft-delete 된 부서도 포함.
@@ -35,6 +38,10 @@ public class DepartmentController {
             return ResponseEntity.status(403)
                     .body(ApiResponse.error("해당 회사의 부서를 조회할 권한이 없습니다."));
         }
+        if (baseDate != null && !baseDate.isBlank() && !ISO_DATE_PATTERN.matcher(baseDate).matches()) {
+            return ResponseEntity.status(400)
+                    .body(ApiResponse.error("base_date 는 YYYY-MM-DD 형식이어야 합니다."));
+        }
 
         List<Map<String, Object>> departments = departmentService.getDepartments(companyCode, includeDeleted, baseDate);
         return ResponseEntity.ok(ApiResponse.success(departments, "부서 목록 조회 성공"));

backend-spring/src/main/java/com/erp/migration/StartupSchemaMigrator.java

@@ -226,9 +226,18 @@ public class StartupSchemaMigrator {
         }
 
         int ok = 0, fail = 0;
+        List<String> failedDbs = new java.util.ArrayList<>();
         for (String db : tenantDbs) {
             if (db == null || db.isBlank() || db.equalsIgnoreCase(metaDb)) continue;
-            if (applyTo(db, "tenant")) ok++; else fail++;
+            if (applyTo(db, "tenant")) {
+                ok++;
+            } else {
+                fail++;
+                failedDbs.add(db);
+            }
+        }
+        if (!failedDbs.isEmpty()) {
+            log.error("[SchemaMigrator] 마이그레이션 실패 테넌트 DB ({}건): {}", failedDbs.size(), failedDbs);
         }
         log.info("[SchemaMigrator] done — meta=done, tenants ok={}, fail={}", ok, fail);
     }

backend-spring/src/main/java/com/erp/service/DepartmentService.java

@@ -150,9 +150,9 @@ public class DepartmentService extends BaseService {
         insertParams.put("location", nullIfBlank(bodyParam(body, "location", "location")));
         sqlSession.insert("department.insertDepartment", insertParams);
 
-        syncManagers(deptCode, body, "approval");
-        syncManagers(deptCode, body, "dept");
-        syncManagers(deptCode, body, "org_leader");
+        syncManagers(deptCode, companyCode, body, "approval");
+        syncManagers(deptCode, companyCode, body, "dept");
+        syncManagers(deptCode, companyCode, body, "org_leader");
 
         log.info("부서 생성 성공: deptCode={}, deptName={}", deptCode, deptName);
 
@@ -221,9 +221,9 @@ public class DepartmentService extends BaseService {
             return null;
         }
 
-        syncManagers(deptCode, body, "approval");
-        syncManagers(deptCode, body, "dept");
-        syncManagers(deptCode, body, "org_leader");
+        syncManagers(deptCode, deptCompanyCode, body, "approval");
+        syncManagers(deptCode, deptCompanyCode, body, "dept");
+        syncManagers(deptCode, deptCompanyCode, body, "org_leader");
 
         log.info("부서 수정 성공: deptCode={}", deptCode);
         return getDepartment(deptCode);
@@ -504,18 +504,29 @@ public class DepartmentService extends BaseService {
     private static final com.fasterxml.jackson.databind.ObjectMapper JSON_MAPPER =
         new com.fasterxml.jackson.databind.ObjectMapper();
 
+    private static final int MAX_MANAGERS_JSON_BYTES = 64 * 1024;
+
     private void parseManagersJson(Map<String, Object> dept, String key) {
         Object raw = dept.get(key);
         if (raw == null) {
             dept.put(key, new java.util.ArrayList<Map<String, Object>>());
             return;
         }
+        String s = raw.toString();
+        if (s.length() > MAX_MANAGERS_JSON_BYTES) {
+            log.warn("parseManagersJson 크기 초과 dept_code={} key={} len={}",
+                     dept.get("dept_code"), key, s.length());
+            dept.put(key, new java.util.ArrayList<Map<String, Object>>());
+            return;
+        }
         try {
             @SuppressWarnings("unchecked")
-            java.util.List<Map<String, Object>> parsed = JSON_MAPPER.readValue(raw.toString(),
+            java.util.List<Map<String, Object>> parsed = JSON_MAPPER.readValue(s,
                 new com.fasterxml.jackson.core.type.TypeReference<java.util.List<Map<String, Object>>>() {});
             dept.put(key, parsed);
         } catch (Exception e) {
+            log.warn("parseManagersJson 실패 dept_code={} key={} err={}",
+                     dept.get("dept_code"), key, e.getMessage());
             dept.put(key, new java.util.ArrayList<Map<String, Object>>());
         }
     }
@@ -526,13 +537,18 @@ public class DepartmentService extends BaseService {
      * 각 값은 List&lt;Map&gt; 형태이며 각 element 에서 "user_id" 만 추출.
      * 최대 10명 검증 + 빈 user_id 무시.
      */
-    private void syncManagers(String deptCode, Map<String, Object> body, String role) {
+    private void syncManagers(String deptCode, String companyCode, Map<String, Object> body, String role) {
         String bodyKey = switch (role) {
             case "approval"   -> "approval_managers";
             case "dept"       -> "dept_managers";
             case "org_leader" -> "org_leaders";
             default -> throw new IllegalArgumentException("Unknown role: " + role);
         };
+        // PUT partial update: 키가 명시적으로 존재할 때만 sync.
+        // body 에 키 자체가 없으면 기존 매핑 보존 (partial update 의도).
+        if (!body.containsKey(bodyKey)) {
+            return;
+        }
         Object raw = body.get(bodyKey);
         java.util.List<String> userIds = new java.util.ArrayList<>();
         if (raw instanceof java.util.List<?> list) {
@@ -558,6 +574,18 @@ public class DepartmentService extends BaseService {
             };
             throw new IllegalArgumentException(roleLabel + " 는 최대 10명까지 등록 가능합니다.");
         }
+        // user_id 가 같은 회사 (or '*') 에 실존하는지 검증 — cross-tenant 차단
+        if (!userIds.isEmpty()) {
+            Map<String, Object> vParams = new HashMap<>();
+            vParams.put("user_ids", userIds);
+            vParams.put("company_code", companyCode);
+            List<String> validUserIds = sqlSession.selectList("department.selectValidUserIds", vParams);
+            if (validUserIds == null || validUserIds.size() != userIds.size()) {
+                Set<String> invalid = new HashSet<>(userIds);
+                if (validUserIds != null) invalid.removeAll(validUserIds);
+                throw new IllegalArgumentException("유효하지 않은 사용자 ID: " + invalid);
+            }
+        }
         // delete-all
         Map<String, Object> delParams = new HashMap<>();
         delParams.put("dept_code", deptCode);

backend-spring/src/main/resources/mapper/department.xml

@@ -37,7 +37,7 @@
       AND D.DELETED_AT IS NULL
     </if>
     <if test="base_date != null and base_date != ''">
-      AND D.START_DATE &lt;= #{base_date}::date
+      AND (D.START_DATE IS NULL OR D.START_DATE &lt;= #{base_date}::date)
       AND (D.END_DATE IS NULL OR D.END_DATE &gt;= #{base_date}::date)
     </if>
     GROUP BY
@@ -339,4 +339,12 @@
     </foreach>
   </insert>
 
+  <!-- 사용자 ID 들이 같은 회사(또는 글로벌 *) 에 실존하는지 검증 — cross-tenant injection 방지 -->
+  <select id="selectValidUserIds" parameterType="map" resultType="string">
+    SELECT USER_ID FROM USER_INFO
+     WHERE (COMPANY_CODE = #{company_code} OR COMPANY_CODE = '*')
+       AND USER_ID IN
+       <foreach collection="user_ids" item="u" open="(" separator="," close=")">#{u}</foreach>
+  </select>
+
 </mapper>

frontend/app/(main)/admin/userMng/deptMngList/page.tsx

@@ -313,8 +313,17 @@ export default function DeptMngListPage() {
       end_date: (dept.end_date ?? "").slice(0, 10),
       sort_order: dept.sort_order ?? 10,
       status: (dept.status as "active" | "inactive") ?? "active",
-      approval_managers: ((dept as any).approval_managers || []).map((m: any) => m.user_id).filter(Boolean),
-      dept_managers: ((dept as any).dept_managers || []).map((m: any) => m.user_id).filter(Boolean),
+      approval_managers: (() => {
+        const arr = ((dept as any).approval_managers || []).map((m: any) => m.user_id).filter(Boolean);
+        // 신규 매핑이 비어있고 옛날 단일 컬럼에 값 있으면 seed (PR #19 이전 데이터 호환)
+        if (arr.length === 0 && dept.approval_manager) return [dept.approval_manager];
+        return arr;
+      })(),
+      dept_managers: (() => {
+        const arr = ((dept as any).dept_managers || []).map((m: any) => m.user_id).filter(Boolean);
+        if (arr.length === 0 && dept.dept_manager) return [dept.dept_manager];
+        return arr;
+      })(),
       org_leaders: ((dept as any).org_leaders || []).map((m: any) => m.user_id).filter(Boolean),
     };
     setDraft(loaded);
@@ -489,6 +498,14 @@ export default function DeptMngListPage() {
       toast({ title: "회사를 선택해주세요", variant: "destructive" });
       return;
     }
+    // 시작일/종료일 정합성 검증
+    if (draft.start_date && draft.end_date && draft.start_date > draft.end_date) {
+      toast({
+        title: "시작일은 종료일보다 빠르거나 같아야 합니다",
+        variant: "destructive",
+      });
+      return;
+    }
 
     // 기본정보 탭 전체 필드를 payload 로 전달 — dept_info 스키마와 1:1 (V019 정리 후)
     const payload = {