diff --git a/packages/backend/src/controller/csrfCheck.ts b/packages/backend/src/controller/csrfCheck.ts
index 727b65b..f5018d5 100644
--- a/packages/backend/src/controller/csrfCheck.ts
+++ b/packages/backend/src/controller/csrfCheck.ts
@@ -5,18 +5,27 @@ import { HttpUtils } from "../utils/http";
 const httpUtils = new HttpUtils();
 
 export class CsrfCheck {
+  private isTargetUri(uri: string): boolean {
+    if (
+      uri.includes("client_id=") &&
+      (uri.includes("response_type=") ||
+        uri.includes("grant_type=") ||
+        uri.includes("redirect_uri=") ||
+        uri.includes("scope=") ||
+        uri.includes("state=") ||
+        uri.includes("nonce="))
+    ) {
+      return true;
+    }
+
+    return false;
+  }
+
   private isOauthUri(request: Request): boolean {
-    const query = request.getQuery() || "";
+    const uri = request.getUrl() || "";
 
     // Check if the request is an OAuth authorization request
-    if (
-      query.includes("client_id=") &&
-      (query.includes("response_type=") ||
-        query.includes("grant_type=") ||
-        query.includes("redirect_uri=") ||
-        query.includes("scope=") ||
-        query.includes("state="))
-    ) {
+    if (this.isTargetUri(uri)) {
       return true;
     }
 
@@ -25,23 +34,10 @@ export class CsrfCheck {
 
   private isOauthRedirectResponse(response: Response): boolean {
     const status = response.getCode();
-    const locationHeader = httpUtils.getHeaderValue(
-      response.getHeaders(),
-      "location"
-    );
+    const uri =
+      httpUtils.getHeaderValue(response.getHeaders(), "location") || "";
 
-    if (
-      status >= 300 &&
-      status < 400 &&
-      locationHeader &&
-      (locationHeader.includes("client_id=") ||
-        locationHeader.includes("response_type=") ||
-        locationHeader.includes("grant_type=") ||
-        locationHeader.includes("redirect_uri=") ||
-        locationHeader.includes("scope=") ||
-        locationHeader.includes("state=") ||
-        locationHeader.includes("code=")) // code is also common in OAuth redirects
-    ) {
+    if (status >= 300 && status < 400 && this.isTargetUri(uri)) {
       return true;
     }
     return false;
@@ -49,7 +45,9 @@ export class CsrfCheck {
 
   private isStateInQuery(request: Request): boolean {
     const query = request.getQuery();
-    const stateValue = httpUtils.getQueryParam(query || "", "state");
+    const stateValue =
+      httpUtils.getQueryParam(query || "", "state") ||
+      httpUtils.getQueryParam(query || "", "nonce");
     if (!stateValue) {
       return false;
     }
@@ -72,17 +70,18 @@ export class CsrfCheck {
 
     // 요청에서 보낸 state 추출
     const query = request.getQuery() || "";
-    const originalState = httpUtils.getQueryParam(query, "state");
+    const originalState =
+      httpUtils.getQueryParam(query, "state") ||
+      httpUtils.getQueryParam(query || "", "nonce");
 
     // 리다이렉트 URL에서 쿼리 부분만 추출
     const locationHeader = httpUtils.getHeaderValue(
       response.getHeaders(),
       "location"
     );
-    const responseState = httpUtils.getQueryParamFromURI(
-      locationHeader || "",
-      "state"
-    );
+    const responseState =
+      httpUtils.getQueryParamFromURI(locationHeader || "", "state") ||
+      httpUtils.getQueryParamFromURI(locationHeader || "", "nonce");
 
     // state가 없거나, 요청값과 다르면 CSRF 위험
     if (!responseState) {