[EDIT] パスワードの文字数上限を24文字に変更しました。

src/main/resources/templates/password_reset.html

@@ -38,7 +38,7 @@
                                class="form-control"
                                th:field="*{password}"
                                minlength="8"
-                               maxlength="255"
+                               maxlength="24"
                                required>
 
                     </div>
@@ -55,7 +55,7 @@
                                class="form-control"
                                th:field="*{passwordConfirm}"
                                minlength="8"
-                               maxlength="255"
+                               maxlength="24"
                                required>
 
                     </div>

src/main/resources/templates/user_register.html

@@ -86,7 +86,7 @@
                                class="form-control"
                                th:field="*{password}"
                                minlength="8"
-                               maxlength="255"
+                               maxlength="24"
                                required>
                     </div>
 

src/main/resources/templates/user_register_confirm.html

@@ -39,7 +39,7 @@
 			<div class="mb-3">
 				<label for="password" class="form-label">パスワード</label>
 				<input type="password" id="password" class="form-control" name="password" th:value="*{password}" minlength="8"
-					maxlength="255" required readonly>
+					maxlength="24" required readonly>
 			</div>
 
 			<div class="mb-3">

src/main/resources/templates/user_register_return.html

@@ -54,7 +54,7 @@
 				class="form-control"
 				th:value="*{password}"
 				minlength="8"
-				maxlength="255"
+				maxlength="24"
 				required>
 			</div>