diff --git a/apps/backend/src/routes/auth.ts b/apps/backend/src/routes/auth.ts
index 108e70d..1d75439 100644
--- a/apps/backend/src/routes/auth.ts
+++ b/apps/backend/src/routes/auth.ts
@@ -99,6 +99,27 @@ export default new Elysia({ prefix: "/auth" })
         }
 
         const userData = await userResponse.json();
+
+        // Guild membership check
+        const guildsResponse = await fetch("https://discord.com/api/users/@me/guilds", {
+            headers: {
+                Authorization: `Bearer ${accessToken}`,
+            },
+        });
+
+        if (!guildsResponse.ok) {
+            console.error("Failed to fetch user guilds", await guildsResponse.text());
+            return status(500, "Failed to fetch user guilds");
+        }
+
+        const guilds = await guildsResponse.json();
+        const targetGuildId = "1274213821459857528";
+        const isMember = guilds.some((guild: any) => guild.id === targetGuildId);
+
+        if (!isMember) {
+            return status(403, "You must be a member of the required guild to join.");
+        }
+
         const isHardcodedOwner = hardcodedOwners.has(String(userData.id));
         const updateSet: { username: string; avatar: string; role?: "admin" } = {
             username: userData.username,
diff --git a/apps/backend/src/routes/post.ts b/apps/backend/src/routes/post.ts
index 6a13617..6bbb086 100644
--- a/apps/backend/src/routes/post.ts
+++ b/apps/backend/src/routes/post.ts
@@ -30,6 +30,36 @@ type ExistsResponse = {
     documentId: string | null;
 };
 
+async function sendDiscordNotification(payload: {
+    title: string;
+    url: string;
+    author: string;
+    tags: string[];
+    imageUrl?: string;
+}) {
+    const webhookUrl = config.discord.webhook;
+    if (!webhookUrl) return;
+
+    try {
+        await fetch(webhookUrl, {
+            method: "POST",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify({
+                embeds: [{
+                    title: payload.title,
+                    url: payload.url,
+                    author: { name: payload.author },
+                    fields: [{ name: "Tags", value: payload.tags.join(", ") || "None" }],
+                    image: payload.imageUrl ? { url: payload.imageUrl } : undefined,
+                    color: 0x00ff00,
+                }],
+            }),
+        });
+    } catch (error) {
+        console.error("[Discord Webhook Error]", error);
+    }
+}
+
 function uploadOk(message: string, extra?: Omit<UploadResponse, "success" | "message">): UploadResponse {
     return {
         success: true,
@@ -230,7 +260,22 @@ export default new Elysia({ prefix: "/post" })
         }),
     })
 
-    .get("/detail/:id", async ({ params, status }) => {
+    .get("/detail/:id", async ({ params, status, jwt, cookie: { mizuki } }) => {
+        const rawToken = mizuki.value;
+        if (typeof rawToken !== "string" || rawToken.length === 0) {
+            return status(401, "Unauthorized");
+        }
+
+        const payload = await jwt.verify(rawToken);
+        if (!payload || typeof payload !== "object" || !("id" in payload) || typeof payload.id !== "string") {
+            return status(401, "Unauthorized");
+        }
+
+        const user = await User.findOne({ userId: payload.id });
+        if (!user) {
+            return status(401, "Unauthorized");
+        }
+
         const post = await MediaUpload.findById(params.id);
         if (!post) {
             return status(404, "포스트를 찾을 수 없습니다.");