diff --git a/app/component/ItemDoctor.js b/app/component/ItemDoctor.js
index 938d9eb..64ee0ed 100644
--- a/app/component/ItemDoctor.js
+++ b/app/component/ItemDoctor.js
@@ -1,3 +1,4 @@
+import { memo } from "react";
 import Image from "next/image";
 import { Button } from "@mui/material";
 import Link from "next/link";
@@ -109,4 +110,4 @@ function ItemDoctor({ doctor, loading, setDoctors, priority = false }) {
   );
 }
 
-export default ItemDoctor;
+export default memo(ItemDoctor);
diff --git a/app/panel/(layout)/layout.js b/app/panel/(layout)/layout.js
index 7423622..d793db7 100644
--- a/app/panel/(layout)/layout.js
+++ b/app/panel/(layout)/layout.js
@@ -4,6 +4,7 @@ import { getUser } from "@/lib/auth";
 import { redirect } from "next/navigation";
 import { cookies } from "next/headers";
 import { fetchReq } from "@/lib/req";
+import { safeJsonParse } from "@/lib/sanitize";
 
 async function LayoutPanel({ children }) {
   const user = await getUser();
@@ -22,7 +23,8 @@ async function LayoutPanel({ children }) {
     const accessToken = cookieStore.get("access_token");
 
     if (userInfo && accessToken) {
-      const parsedUserInfo = JSON.parse(userInfo.value);
+      const parsedUserInfo = safeJsonParse(userInfo.value);
+      if (!parsedUserInfo) return;
       const representationUuid = parsedUserInfo?.representation_uuid;
 
       if (representationUuid) {
diff --git a/app/payment/[uuid]/page.js b/app/payment/[uuid]/page.js
index 68e2c90..28f09da 100644
--- a/app/payment/[uuid]/page.js
+++ b/app/payment/[uuid]/page.js
@@ -199,8 +199,13 @@ export default function PaymentDetailsPage() {
                             <>
                                 <button
                                     onClick={() => {
-                                        const paymentUrl = `${process.env.NEXT_PUBLIC_API_URL}/payment/${payment.uuid}`;
-                                        window.location.href = paymentUrl;
+                                        try {
+                                          const apiOrigin = new URL(process.env.NEXT_PUBLIC_API_URL).origin;
+                                          const paymentUrl = new URL(`/payment/${payment.uuid}`, apiOrigin);
+                                          if (paymentUrl.origin === apiOrigin) {
+                                            window.location.href = paymentUrl.href;
+                                          }
+                                        } catch {}
                                     }}
                                     className="flex-1 bg-[#5559CE] hover:bg-[#4448b3] text-white font-bold py-3 px-6 rounded-lg transition-colors"
                                 >
diff --git a/components/appointment/index.js b/components/appointment/index.js
index b2c848e..60eb932 100644
--- a/components/appointment/index.js
+++ b/components/appointment/index.js
@@ -4,6 +4,7 @@ import { useEffect, useState } from "react";
 import { request } from "@/services/response";
 import Cookies from "js-cookie";
 import Container from "./Container";
+import { safeJsonParse } from "@/lib/sanitize";
 
 const defaultData = {
   phone: { value: "", isEdit: false },
@@ -39,7 +40,7 @@ function AppointmentPage({ doctor, disabledDates, matchedCity }) {
       setIsLoading(true);
 
       const userInfo = Cookies.get("userInfo");
-      const parsedData = userInfo && JSON.parse(userInfo);
+      const parsedData = safeJsonParse(userInfo);
       const usernameFromCookie = parsedData?.username || "";
 
       // ابتدا شماره موبایل را از Cookie ست می‌کنیم
@@ -112,7 +113,7 @@ function AppointmentPage({ doctor, disabledDates, matchedCity }) {
     const refetchUserData = async () => {
       if (step === 3) {
         const userInfo = Cookies.get("userInfo");
-        const parsedData = userInfo && JSON.parse(userInfo);
+        const parsedData = safeJsonParse(userInfo);
         const usernameFromCookie = parsedData?.username || "";
 
         if (userInfo && parsedData && !data.uuid) {
diff --git a/components/blog/detail/Caption.js b/components/blog/detail/Caption.js
index 4732c53..ffc0a28 100644
--- a/components/blog/detail/Caption.js
+++ b/components/blog/detail/Caption.js
@@ -1,4 +1,6 @@
 import React from "react";
+import Image from "next/image";
+import { sanitizeHtml } from "@/lib/sanitize";
 
 function Caption({ data }) {
   const imageUrl = data?.images?.[0]?.url;
@@ -6,16 +8,19 @@ function Caption({ data }) {
   return (
     <>
       {imageUrl && imageUrl.trim() !== "" && (
-        <img
-          className="rounded-[8px] overflow-hidden w-full object-cover"
-          src={imageUrl}
-          alt={data?.title || "blog cover"}
-        />
+        <div className="relative w-full aspect-video rounded-[8px] overflow-hidden">
+          <Image
+            src={imageUrl}
+            alt={data?.title || "blog cover"}
+            fill
+            className="object-cover"
+          />
+        </div>
       )}
       {data?.body?.value && (
         <div
           className="my-[12px] sm:my-[16px] md:my-[20px] lg:my-[24px] text-[#525252] text-[14px] md:text-[15px] lg:text-[16px] font-normal leading-[26px] sm:leading-[28px] md:leading-[30px] lg:leading-[32px]"
-          dangerouslySetInnerHTML={{ __html: data.body.value }}
+          dangerouslySetInnerHTML={{ __html: sanitizeHtml(data.body.value) }}
         />
       )}
     </>
diff --git a/components/clinic/components/about/TextDetail.js b/components/clinic/components/about/TextDetail.js
index 34465ca..11e1b13 100644
--- a/components/clinic/components/about/TextDetail.js
+++ b/components/clinic/components/about/TextDetail.js
@@ -1,6 +1,7 @@
 import { useState } from "react";
 import { Button } from "@mui/material";
 import MultilineLoading from "@/app/component/loading/Multiline";
+import { sanitizeHtml } from "@/lib/sanitize";
 
 function TextDetail({ data }) {
   const [isMore, setIsMore] = useState(false);
@@ -20,7 +21,7 @@ function TextDetail({ data }) {
                       "after:bg-[linear-gradient(transparent,#FAFAFA)] max-h-[200px] after:absolute"
                 }
             `}
-          dangerouslySetInnerHTML={{ __html: data?.caption }}
+          dangerouslySetInnerHTML={{ __html: sanitizeHtml(data?.caption) }}
         ></p>
       </MultilineLoading>
       {data?.caption?.length > 180 && (
diff --git a/components/dashboard/userAccount/sidebars/transactions/index.js b/components/dashboard/userAccount/sidebars/transactions/index.js
index f112e6d..b7bf2a6 100644
--- a/components/dashboard/userAccount/sidebars/transactions/index.js
+++ b/components/dashboard/userAccount/sidebars/transactions/index.js
@@ -5,6 +5,7 @@ import List from "./List";
 import Head from "./Head";
 import { request } from "@/services/response";
 import Cookies from "js-cookie";
+import { safeJsonParse } from "@/lib/sanitize";
 
 function Transactions({ user, loading }) {
   const [payments, setPayments] = useState([]);
@@ -23,7 +24,8 @@ function Transactions({ user, loading }) {
           return;
         }
 
-        const parsedData = JSON.parse(userInfo);
+        const parsedData = safeJsonParse(userInfo);
+        if (!parsedData) { setIsLoading(false); return; }
         const userId = parsedData.id || parsedData.uuid;
 
         if (!userId) {
diff --git a/components/register/verificationPage/Recode.js b/components/register/verificationPage/Recode.js
index 0d8dcf8..e703d51 100644
--- a/components/register/verificationPage/Recode.js
+++ b/components/register/verificationPage/Recode.js
@@ -2,45 +2,66 @@ import RetryLogin from "@/components/icons/RetryLogin";
 import { changeNumToDefault } from "@/helper";
 import { request } from "@/services/response";
 import { Button } from "@mui/material";
+import { useEffect, useRef } from "react";
+
 const time_resend_code = 120;
 
 function Recode({ retryIcon, timer, setUuid, num, setTimer }) {
+  const timerIntervalRef = useRef(null);
+  const animIntervalRef = useRef(null);
+
+  useEffect(() => {
+    return () => {
+      if (timerIntervalRef.current) clearInterval(timerIntervalRef.current);
+      if (animIntervalRef.current) clearInterval(animIntervalRef.current);
+    };
+  }, []);
+
   const handleTimer = () => {
     setTimer("loading");
+    if (timerIntervalRef.current) clearInterval(timerIntervalRef.current);
     setTimeout(() => {
       setTimer(time_resend_code);
       let timePresent = time_resend_code;
-      const timerInterval = setInterval(() => {
+      timerIntervalRef.current = setInterval(() => {
         timePresent--;
         setTimer(timePresent);
-
-        !timePresent && clearInterval(timerInterval);
+        if (!timePresent) {
+          clearInterval(timerIntervalRef.current);
+          timerIntervalRef.current = null;
+        }
       }, 1000);
     }, 1000);
   };
 
   const rotateIcon = () => {
+    if (!retryIcon.current) return;
     retryIcon.current.classList.add("retry-icon");
     setTimeout(() => {
-      retryIcon.current && retryIcon.current.classList.remove("retry-icon");
+      retryIcon.current?.classList.remove("retry-icon");
     }, 1000);
   };
 
   const handleReq = () => {
     rotateIcon();
-    const interval = setInterval(() => {
+    if (animIntervalRef.current) clearInterval(animIntervalRef.current);
+    animIntervalRef.current = setInterval(() => {
       rotateIcon();
     }, 1200);
     request
       .sendCode(changeNumToDefault(num), "")
       .then((response) => {
-        clearInterval(interval);
+        clearInterval(animIntervalRef.current);
+        animIntervalRef.current = null;
         if (response.uuid) {
           setUuid(response.uuid);
           handleTimer();
         }
       })
-      .catch(() => clearInterval(interval));
+      .catch(() => {
+        clearInterval(animIntervalRef.current);
+        animIntervalRef.current = null;
+      });
   };
 
   return (
@@ -49,7 +70,6 @@ function Recode({ retryIcon, timer, setUuid, num, setTimer }) {
       disabled={typeof timer === "number" && timer !== 0}
       onClick={() => {
         if (!timer && timer !== "loading") {
-          // handleTimer();
           handleReq();
         }
       }}
diff --git a/helper/index.js b/helper/index.js
index 9ec91d0..29175ec 100644
--- a/helper/index.js
+++ b/helper/index.js
@@ -217,8 +217,12 @@ export function hasDataChanged(previousData, newData) {
 
 export const getParsedUserInfo = () => {
   const user = Cookies.get("userInfo");
-  const parsedUserInfo = user && JSON.parse(user);
-  return parsedUserInfo;
+  if (!user) return null;
+  try {
+    return JSON.parse(user);
+  } catch {
+    return null;
+  }
 };
 
 export const handleTimeExpiresToken = (expires_in) => {
diff --git a/lib/ability.js b/lib/ability.js
index f266dab..0d51dee 100644
--- a/lib/ability.js
+++ b/lib/ability.js
@@ -1,4 +1,5 @@
 import { AbilityBuilder, createMongoAbility } from "@casl/ability";
+import { safeJsonParse } from "./sanitize";
 
 export function defineAbilitiesFor(user) {
   const { can, cannot, build } = new AbilityBuilder(createMongoAbility);
@@ -6,9 +7,9 @@ export function defineAbilitiesFor(user) {
   if (user) {
     can("access", "Dashboard");
     cannot("access", "Login");
-    const parsedData = JSON.parse(user.value);
-
-    if (parsedData.roles && Object.values(parsedData.roles).includes("representation")) {
+    const parsedData = safeJsonParse(user.value);
+    const roles = parsedData?.roles;
+    if (roles && Array.isArray(Object.values(roles)) && Object.values(roles).includes("representation")) {
       can("access", "Panel");
     }
   } else {
diff --git a/lib/req.js b/lib/req.js
index b95985a..cad767a 100644
--- a/lib/req.js
+++ b/lib/req.js
@@ -1,11 +1,10 @@
 import axios from "axios";
 import https from "https";
 
-// Create axios instance with SSL verification disabled for development
 const axiosInstance = axios.create({
-  httpsAgent: new https.Agent({
-    rejectUnauthorized: false
-  })
+  ...(process.env.NODE_ENV === "development" && {
+    httpsAgent: new https.Agent({ rejectUnauthorized: false }),
+  }),
 });
 
 export const fetchReq = async (url, headers) => {
diff --git a/lib/sanitize.js b/lib/sanitize.js
new file mode 100644
index 0000000..549bf41
--- /dev/null
+++ b/lib/sanitize.js
@@ -0,0 +1,26 @@
+const DANGEROUS_TAGS = ['script', 'iframe', 'object', 'embed', 'link', 'meta', 'base', 'form'];
+
+export function sanitizeHtml(html) {
+  if (!html || typeof html !== 'string') return '';
+
+  let sanitized = html;
+
+  DANGEROUS_TAGS.forEach((tag) => {
+    const openClose = new RegExp(`<${tag}[\\s\\S]*?(?:<\\/${tag}>|/?>)`, 'gi');
+    sanitized = sanitized.replace(openClose, '');
+  });
+
+  sanitized = sanitized.replace(/\s+on\w+\s*=\s*(?:"[^"]*"|'[^']*'|[^\s>]*)/gi, '');
+  sanitized = sanitized.replace(/(?:javascript|vbscript):/gi, '');
+
+  return sanitized;
+}
+
+export function safeJsonParse(str, fallback = null) {
+  if (!str) return fallback;
+  try {
+    return JSON.parse(str);
+  } catch {
+    return fallback;
+  }
+}
diff --git a/services/api.js b/services/api.js
index b5d222b..56928fb 100644
--- a/services/api.js
+++ b/services/api.js
@@ -1,6 +1,5 @@
 import axios from "axios";
 import Cookies from "js-cookie";
-import "react-toastify/dist/ReactToastify.css";
 
 const BASE_URL = process.env.NEXT_PUBLIC_API_URL;
 
@@ -35,8 +34,13 @@ api.interceptors.response.use(
   },
   (error) => {
     if (error?.response?.status === 401 && typeof window !== "undefined") {
+      const hostname = window.location.hostname;
+      const domain = hostname.includes("localhost")
+        ? undefined
+        : `.${hostname.split(".").slice(-2).join(".")}`;
+      const opts = { path: "/", ...(domain && { domain }) };
       ["access_token", "refresh_token", "uuid", "userInfo"].forEach((key) => {
-        document.cookie = `${key}=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;`;
+        Cookies.remove(key, opts);
       });
       window.location.href = "/login";
     }