diff --git a/server/src/main/java/cn/keking/config/WebConfig.java b/server/src/main/java/cn/keking/config/WebConfig.java
index b1ee63c0..c42e9e73 100644
--- a/server/src/main/java/cn/keking/config/WebConfig.java
+++ b/server/src/main/java/cn/keking/config/WebConfig.java
@@ -46,6 +46,7 @@ public class WebConfig implements WebMvcConfigurer {
         filterUri.add("/onlinePreview");
         filterUri.add("/picturesPreview");
         filterUri.add("/getCorsFile");
+        filterUri.add("/addTask");
         filterUri.add("/pdfjs/web/viewer.html");
         filterUri.add("/msg/index.html");
         filterUri.add("/eml/index.html");
@@ -64,6 +65,7 @@ public class WebConfig implements WebMvcConfigurer {
         filterUri.add("/onlinePreview");
         filterUri.add("/picturesPreview");
         filterUri.add("/getCorsFile");
+        filterUri.add("/addTask");
         TrustDirFilter filter = new TrustDirFilter();
         FilterRegistrationBean<TrustDirFilter> registrationBean = new FilterRegistrationBean<>();
         registrationBean.setFilter(filter);
diff --git a/server/src/main/java/cn/keking/service/FileConvertQueueTask.java b/server/src/main/java/cn/keking/service/FileConvertQueueTask.java
index 6096b92b..c4e5e9fa 100644
--- a/server/src/main/java/cn/keking/service/FileConvertQueueTask.java
+++ b/server/src/main/java/cn/keking/service/FileConvertQueueTask.java
@@ -3,6 +3,8 @@ package cn.keking.service;
 import cn.keking.model.FileAttribute;
 import cn.keking.model.FileType;
 import cn.keking.service.cache.CacheService;
+import cn.keking.web.filter.TrustDirFilter;
+import cn.keking.web.filter.TrustHostFilter;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Service;
@@ -58,6 +60,10 @@ public class FileConvertQueueTask {
                 try {
                     url = cacheService.takeQueueTask();
                     if (url != null) {
+                        if (!TrustHostFilter.isTrustedSourceUrl(url) || !TrustDirFilter.isTrustedFileUrl(url)) {
+                            logger.warn("拒绝处理不受信任的预览转换任务，url：{}", url);
+                            continue;
+                        }
                         FileAttribute fileAttribute = fileHandlerService.getFileAttribute(url, null);
                         FileType fileType = fileAttribute.getType();
                         logger.info("正在处理预览转换任务，url：{}，预览类型：{}", url, fileType);
diff --git a/server/src/main/java/cn/keking/web/controller/FileController.java b/server/src/main/java/cn/keking/web/controller/FileController.java
index 247b6204..e20633fb 100644
--- a/server/src/main/java/cn/keking/web/controller/FileController.java
+++ b/server/src/main/java/cn/keking/web/controller/FileController.java
@@ -29,6 +29,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.nio.file.DirectoryStream;
 import java.nio.file.Files;
+import java.nio.file.InvalidPathException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.nio.file.attribute.BasicFileAttributes;
@@ -147,6 +148,28 @@ public class FileController {
         }
     }
 
+    private Path getDemoBasePath() {
+        return Paths.get(fileDir, demoDir).toAbsolutePath().normalize();
+    }
+
+    private Path resolveDemoPath(String path) {
+        Path demoBasePath = getDemoBasePath();
+        try {
+            if (ObjectUtils.isEmpty(path)) {
+                return demoBasePath;
+            }
+            Path normalizedPath = demoBasePath.resolve(path).normalize();
+            if (!normalizedPath.startsWith(demoBasePath)) {
+                logger.warn("检测到非法目录访问，path：{}", path);
+                return null;
+            }
+            return normalizedPath;
+        } catch (InvalidPathException e) {
+            logger.warn("解析目录路径失败，path：{}", path, e);
+            return null;
+        }
+    }
+
     @PostMapping("/fileUpload")
     public ReturnResponse<Object> fileUpload(@RequestParam("file") MultipartFile file,
                                              @RequestParam(value = "path", defaultValue = "") String path) {
@@ -341,17 +364,20 @@ public class FileController {
             }
 
             // ==================== 2. 构建路径和验证 ====================
-            String basePath = fileDir + demoPath;
-            if (!ObjectUtils.isEmpty(path)) {
-                basePath += path + File.separator;
+            Path resolvedPath = resolveDemoPath(path);
+            if (resolvedPath == null) {
+                result.put("total", 0);
+                result.put("data", Collections.emptyList());
+                return result;
             }
 
-            File currentDir = new File(basePath);
+            File currentDir = resolvedPath.toFile();
             if (!currentDir.exists() || !currentDir.isDirectory()) {
                 result.put("total", 0);
                 result.put("data", Collections.emptyList());
                 return result;
             }
+            String basePath = resolvedPath.toString();
 
             // ==================== 3. 收集所有文件路径 ====================
             List<Path> allPaths = new ArrayList<>();
diff --git a/server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java b/server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java
index d772ced1..2110685d 100644
--- a/server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java
+++ b/server/src/main/java/cn/keking/web/controller/OnlinePreviewController.java
@@ -8,6 +8,8 @@ import cn.keking.service.FilePreviewFactory;
 import cn.keking.service.cache.CacheService;
 import cn.keking.service.impl.OtherFilePreviewImpl;
 import cn.keking.utils.*;
+import cn.keking.web.filter.TrustDirFilter;
+import cn.keking.web.filter.TrustHostFilter;
 import fr.opensagres.xdocreport.core.io.IOUtils;
 import org.apache.commons.codec.binary.Base64;
 import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
@@ -231,6 +233,11 @@ public class OnlinePreviewController {
             logger.info("{}，url：{}", errorMsg, fileUrls);
             return errorMsg;
         }
+        if (!TrustHostFilter.isTrustedSourceUrl(fileUrls) || !TrustDirFilter.isTrustedFileUrl(fileUrls)) {
+            String errorMsg = "访问不合法：来源地址不受信任!";
+            logger.info("{}，url：{}", errorMsg, fileUrls);
+            return errorMsg;
+        }
         logger.info("添加转码队列url：{}", fileUrls);
         cacheService.addQueueTask(fileUrls);
         return "success";
diff --git a/server/src/main/java/cn/keking/web/filter/TrustDirFilter.java b/server/src/main/java/cn/keking/web/filter/TrustDirFilter.java
index f71e9fd3..896f8f2e 100644
--- a/server/src/main/java/cn/keking/web/filter/TrustDirFilter.java
+++ b/server/src/main/java/cn/keking/web/filter/TrustDirFilter.java
@@ -28,7 +28,7 @@ import java.util.Locale;
 public class TrustDirFilter implements Filter {
 
     private String notTrustDirView;
-    private final Logger logger = LoggerFactory.getLogger(TrustDirFilter.class);
+    private static final Logger logger = LoggerFactory.getLogger(TrustDirFilter.class);
 
 
     @Override
@@ -59,6 +59,47 @@ public class TrustDirFilter implements Filter {
 
     }
 
+    public static boolean isTrustedFileUrl(String urlPath) {
+        // 判断URL是否合法
+        if (KkFileUtils.isIllegalFileName(urlPath) || !StringUtils.hasText(urlPath) || !WebUtils.isValidUrl(urlPath)) {
+            return false;
+        }
+        try {
+            URL url = WebUtils.normalizedURL(urlPath);
+
+            if ("file".equals(url.getProtocol().toLowerCase(Locale.ROOT))) {
+                String filePath = URLDecoder.decode(url.getPath(), StandardCharsets.UTF_8.name());
+                // 将文件路径转换为File对象
+                File targetFile = new File(filePath);
+                // 将配置目录也转换为File对象
+                File fileDir = new File(ConfigConstants.getFileDir());
+                File localPreviewDir = new File(ConfigConstants.getLocalPreviewDir());
+                try {
+                    // 获取规范路径
+                    String canonicalFilePath = targetFile.getCanonicalPath();
+                    String canonicalFileDir = fileDir.getCanonicalPath();
+                    String canonicalLocalPreviewDir = localPreviewDir.getCanonicalPath();
+                    return isSubDirectory(canonicalFileDir, canonicalFilePath) || isSubDirectory(canonicalLocalPreviewDir, canonicalFilePath);
+                } catch (IOException e) {
+                    LoggerFactory.getLogger(TrustDirFilter.class).warn("获取规范路径失败，使用原始路径比较", e);
+                    String absFilePath = targetFile.getAbsolutePath();
+                    String absFileDir = fileDir.getAbsolutePath();
+                    String absLocalPreviewDir = localPreviewDir.getAbsolutePath();
+                    absFilePath = absFilePath.replace('\\', '/');
+                    absFileDir = absFileDir.replace('\\', '/');
+                    absLocalPreviewDir = absLocalPreviewDir.replace('\\', '/');
+                    if (!absFileDir.endsWith("/")) absFileDir += "/";
+                    if (!absLocalPreviewDir.endsWith("/")) absLocalPreviewDir += "/";
+                    return absFilePath.startsWith(absFileDir) || absFilePath.startsWith(absLocalPreviewDir);
+                }
+            }
+            return true;
+        } catch (IOException | GalimatiasParseException e) {
+            LoggerFactory.getLogger(TrustDirFilter.class).error("解析URL异常，url：{}", urlPath, e);
+            return false;
+        }
+    }
+
     private boolean allowPreview(String urlPath) {
         // 判断URL是否合法
         if (KkFileUtils.isIllegalFileName(urlPath) || !StringUtils.hasText(urlPath) || !WebUtils.isValidUrl(urlPath)) {
@@ -107,7 +148,7 @@ public class TrustDirFilter implements Filter {
     /**
      * 检查子路径是否在父路径下（跨平台）
      */
-    private boolean isSubDirectory(String parentDir, String childPath) {
+    private static boolean isSubDirectory(String parentDir, String childPath) {
         try {
             File parent = new File(parentDir);
             File child = new File(childPath);
diff --git a/server/src/main/java/cn/keking/web/filter/TrustHostFilter.java b/server/src/main/java/cn/keking/web/filter/TrustHostFilter.java
index 759a573a..9a4fb577 100644
--- a/server/src/main/java/cn/keking/web/filter/TrustHostFilter.java
+++ b/server/src/main/java/cn/keking/web/filter/TrustHostFilter.java
@@ -70,6 +70,14 @@ public class TrustHostFilter implements Filter {
         }
     }
 
+    public static boolean isTrustedSourceUrl(String url) {
+        if (!WebUtils.isValidUrl(url)) {
+            return false;
+        }
+        String host = WebUtils.getHost(url);
+        return !new TrustHostFilter().isNotTrustHost(host);
+    }
+
     public boolean isNotTrustHost(String host) {
         if (host == null || host.trim().isEmpty()) {
             logger.warn("主机名为空或无效，拒绝访问");