diff --git a/dist/plugin_package.zip b/dist/plugin_package.zip
new file mode 100644
index 0000000..2818467
Binary files /dev/null and b/dist/plugin_package.zip differ
diff --git a/package.json b/package.json
index 7d2ba1b..ccb27ef 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "caido-oauth",
+  "name": "caido-oauth-dev",
   "version": "0.0.0",
   "private": true,
   "scripts": {
diff --git a/packages/backend/src/controller/csrfCheck.ts b/packages/backend/src/controller/csrfCheck.ts
new file mode 100644
index 0000000..727b65b
--- /dev/null
+++ b/packages/backend/src/controller/csrfCheck.ts
@@ -0,0 +1,181 @@
+import type { Request, Response } from "caido:utils";
+import type { SDK, DefineAPI } from "caido:plugin";
+import { HttpUtils } from "../utils/http";
+
+const httpUtils = new HttpUtils();
+
+export class CsrfCheck {
+  private isOauthUri(request: Request): boolean {
+    const query = request.getQuery() || "";
+
+    // 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="))
+    ) {
+      return true;
+    }
+
+    return false;
+  }
+
+  private isOauthRedirectResponse(response: Response): boolean {
+    const status = response.getCode();
+    const locationHeader = 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
+    ) {
+      return true;
+    }
+    return false;
+  }
+
+  private isStateInQuery(request: Request): boolean {
+    const query = request.getQuery();
+    const stateValue = httpUtils.getQueryParam(query || "", "state");
+    if (!stateValue) {
+      return false;
+    }
+    return true;
+  }
+
+  private checkStateAtResponseLocationHeader(
+    request: Request,
+    response: Response
+  ): string[] | 0 {
+    if (
+      !(
+        this.isOauthUri(request) &&
+        this.isStateInQuery(request) &&
+        this.isOauthRedirectResponse(response)
+      )
+    ) {
+      return 0; // Not a target, no CSRF risk
+    }
+
+    // 요청에서 보낸 state 추출
+    const query = request.getQuery() || "";
+    const originalState = httpUtils.getQueryParam(query, "state");
+
+    // 리다이렉트 URL에서 쿼리 부분만 추출
+    const locationHeader = httpUtils.getHeaderValue(
+      response.getHeaders(),
+      "location"
+    );
+    const responseState = httpUtils.getQueryParamFromURI(
+      locationHeader || "",
+      "state"
+    );
+
+    // state가 없거나, 요청값과 다르면 CSRF 위험
+    if (!responseState) {
+      // missing state
+      return ["state parameter is missing in the response location header"];
+    }
+    if (originalState !== responseState) {
+      // mismatch
+      return ["state parameter mismatch between request and response"];
+    }
+
+    return 0; // no CSRF risk detected
+  }
+
+  // private async checkStateReuse(
+  //   request: Request,
+  //   originResponse: Response
+  // ): Promise<string[] | 0> {
+  //   // uri에 oauth 관련 파라미터가 없지만, 응답이 oauth 리다이렉트 응답인지 확인
+  //   // 즉, 처음으로 state를 발급한 요청인지 확인
+  //   if (
+  //     !(
+  //       !this.isOauthUri(request) &&
+  //       this.isOauthRedirectResponse(originResponse)
+  //     )
+  //   ) {
+  //     return 0; // Not a target, no CSRF risk
+  //   }
+
+  //   const originResponseLocationHeader = httpUtils.getHeaderValue(
+  //     originResponse.getHeaders(),
+  //     "location"
+  //   );
+  //   const originState = httpUtils.getQueryParamFromURI(
+  //     originResponseLocationHeader || "",
+  //     "state"
+  //   );
+
+  //   const requestHeaders = request.getHeaders();
+  //   const noCookieHeaders = httpUtils.removeHeaders(requestHeaders, ["cookie"]);
+  //   const newResponse = await httpUtils.resend(request, {
+  //     headers: noCookieHeaders,
+  //   });
+  //   const newLocationHeader = httpUtils.getHeaderValue(
+  //     newResponse.getHeaders(),
+  //     "location"
+  //   );
+  //   const newState = httpUtils.getQueryParamFromURI(
+  //     newLocationHeader || "",
+  //     "state"
+  //   );
+
+  //   if (originState === newState) {
+  //     return [
+  //       "State parameter reused in the response location header, indicating a potential CSRF risk",
+  //     ];
+  //   }
+
+  //   return 0; // no CSRF risk detected
+  // }
+
+  async checker(
+    sdk: SDK<DefineAPI<{}>, {}>,
+    request: Request,
+    response: Response
+  ): Promise<void> {
+    let result = ``;
+
+    // 쿼리에 state 파라미터가 없으면 CSRF 위험
+    if (this.isOauthUri(request) && !this.isStateInQuery(request)) {
+      result += "CSRF risk: missing state parameter"; // CSRF risk: missing state parameter
+    }
+
+    // location 헤더에 state 파라미터가 없거나, 요청에서 보낸 state와 다르면 CSRF 위험
+    const stateAtResponseLocationHeaderCheck =
+      this.checkStateAtResponseLocationHeader(request, response);
+    if (stateAtResponseLocationHeaderCheck !== 0) {
+      result += `, ${stateAtResponseLocationHeaderCheck.join(", ")}`;
+    }
+
+    // // 처음으로 state를 발급한 요청에서 state 파라미터를 바꿔서 보내기
+    // const reusedStateCheck = await this.checkStateReuse(request, response);
+    // if (reusedStateCheck !== 0) {
+    //   result += `, ${reusedStateCheck.join(", ")}`;
+    // }
+
+    if (result) {
+      await sdk.findings.create({
+        title: "csrf vuln",
+        description: `SSO-related parameters detected in response:\n\n${request.getMethod()} ${request.getUrl()} : ${result}`,
+        request,
+        reporter: "csrf reporter",
+      });
+    }
+  }
+}
diff --git a/packages/backend/src/index.ts b/packages/backend/src/index.ts
index 2eccd6d..a24d2c7 100644
--- a/packages/backend/src/index.ts
+++ b/packages/backend/src/index.ts
@@ -1,49 +1,49 @@
 import type { SDK, DefineAPI } from "caido:plugin";
-import type { Request } from "caido:utils";
-import { ImplicitGrantController } from "./controller/implictGrant";
-import { AuthZCodeGrantController } from "./controller/authZCodeGrant";
+import type { Request, Response } from "caido:utils";
+// import { ImplicitGrantController } from "./controller/implictGrant";
+// import { AuthZCodeGrantController } from "./controller/authZCodeGrant";
+import { CsrfCheck } from "./controller/csrfCheck";
 import { PKCECheck } from "./controller/PKCECheck";
 
 export type API = DefineAPI<{}>;
 
-const implicitGrantController = new ImplicitGrantController();
-const authZCodeGrantController = new AuthZCodeGrantController();
+const csrfCheck = new CsrfCheck();
+// const implicitGrantController = new ImplicitGrantController();
+// const authZCodeGrantController = new AuthZCodeGrantController();
 const pkceCheckController = new PKCECheck();
 
-// function matchSSORequest(req: Request): boolean {
-//   const raw = req.getRaw().toString();
-
-//   // 조건 3: Raw request에 SAMLRequest 또는 SAMLResponse 포함
-//   if (raw.includes("SAMLRequest=") || raw.includes("SAMLResponse=")) {
-//     return true;
-//   }
-
-//   return false;
-// }
-
-// function matchAccessTokenResponse(resp: Response): boolean {
-//   const raw = resp.getRaw().toString();
-
-//   const match = /"access_token"\s*:\s*"([^"]+)"/.exec(raw);
-//   return !!match;
-// }
-
 export function init(sdk: SDK<API>) {
-  sdk.events.onInterceptRequest(async (sdk, req: Request) => {
-    const result =
-      authZCodeGrantController.testReq(req) ||
-      implicitGrantController.testReq(req);
+  // sdk.events.onInterceptRequest(async (sdk, req: Request) => {
+  //   const result = csrfCheck.checker(req);
 
-    if (result) {
+  //   if (result) {
+  //     await sdk.findings.create({
+  //       title: "Possible SSO Request Detected",
+  //       description: `SSO-related parameters detected in request:\n\n${req.getMethod()} ${req.getUrl()} : ${result}`,
+  //       request: req,
+  //       reporter: "",
+  //     });
+  //   }
+  // });
+
+  sdk.events.onInterceptResponse(
+    async (sdk: SDK<DefineAPI<{}>, {}>, req: Request, resp: Response) => {
+      await csrfCheck.checker(sdk, req, resp);
       await pkceCheckController.test(sdk, req);
+      // sdk.events.onInterceptRequest(async (sdk, req: Request) => {
+      //   const result =
+      //     authZCodeGrantController.testReq(req) ||
+      //     implicitGrantController.testReq(req);
 
-      await sdk.findings.create({
-        title: "Possible SSO Request Detected",
-        description: `SSO-related parameters detected in request:\n\n${req.getMethod()} ${req.getUrl()} : ${result}`,
-        request: req,
-        reporter: "",
-      });
+      //   if (result) {
+      //     await pkceCheckController.test(sdk, req);
+
+      //     await sdk.findings.create({
+      //       title: "Possible SSO Request Detected",
+      //       description: `SSO-related parameters detected in request:\n\n${req.getMethod()} ${req.getUrl()} : ${result}`,
+      //       request: req,
+      //       reporter: "",
+      //     });
     }
-
-  });
+  );
 }
diff --git a/packages/backend/src/utils/http.ts b/packages/backend/src/utils/http.ts
new file mode 100644
index 0000000..56a6fe1
--- /dev/null
+++ b/packages/backend/src/utils/http.ts
@@ -0,0 +1,210 @@
+let instance: HttpUtils | null = null;
+export class HttpUtils {
+  /**
+   * 싱글턴 인스턴스를 생성합니다.
+   */
+  public constructor() {
+    if (instance) {
+      return instance;
+    }
+    instance = this;
+    return instance;
+  }
+
+  /**
+   * URI 디코딩 후 소문자로 변환하는 헬퍼 함수
+   * @param value - 디코딩하고 소문자로 변환할 문자열
+   * @returns 디코딩 및 소문자 변환된 문자열
+   */
+  decodeAndLower(value: string): string {
+    try {
+      return decodeURIComponent(value).toLowerCase();
+    } catch {
+      return value.toLowerCase();
+    }
+  }
+
+  /**
+   * 헤더 객체의 키와 값을 전부 소문자로 변환합니다.
+   * @param headers  - Record<string, string | string[]> 형태의 헤더 맵
+   * @returns        - 키와 값이 모두 소문자로 변환된 새 헤더 맵
+   */
+  lowerCaseAllHeaders(
+    headers: Record<string, string | string[]>
+  ): Record<string, string | string[]> {
+    const result: Record<string, string | string[]> = {};
+
+    for (const [rawKey, rawValue] of Object.entries(headers)) {
+      const key = this.decodeAndLower(rawKey);
+
+      if (Array.isArray(rawValue)) {
+        result[key] = rawValue.map((v) => this.decodeAndLower(v));
+      } else {
+        result[key] = this.decodeAndLower(rawValue);
+      }
+    }
+
+    return result;
+  }
+
+  getQueryParamFromURI(uri: string, key: string): string | null {
+    uri = uri.toLowerCase();
+    key = key.toLowerCase();
+    try {
+      const urlObj = new URL(uri);
+      return urlObj.searchParams.get(key);
+    } catch (e) {
+      return null;
+    }
+  }
+
+  // Query
+  /**
+   * 주어진 쿼리 문자열(query)에서 key에 해당하는 값을 반환합니다.
+   * @param query  - "a=1&b=2..." 형태의 쿼리 문자열 (맨 앞 ? 는 없어야 합니다)
+   * @param key    - 가져오고 싶은 파라미터 이름
+   * @returns      - 해당 파라미터 값, 없으면 null
+   */
+  getQueryParam(query: string, key: string): string | null {
+    query = query.toLowerCase();
+    key = key.toLowerCase();
+
+    const params = new URLSearchParams(query);
+    return params.get(key);
+  }
+
+  /**
+   * 주어진 쿼리 문자열(query)에 key=value를 설정하고, 전체 쿼리 문자열을 반환합니다.
+   * - 이미 key가 있으면 덮어쓰기(set), 없으면 새로 추가합니다.
+   * @param query  - "a=1&b=2..." 형태의 쿼리 문자열 (맨 앞 ? 는 없어야 합니다)
+   * @param key    - 설정할 파라미터 이름
+   * @param value  - 설정할 값
+   * @returns      - "a=1&b=2&c=3..." 형태의 새로운 쿼리 문자열
+   */
+  setQueryParam(query: string, key: string, value: string): string {
+    query = query.toLowerCase();
+    key = key.toLowerCase();
+    value = value.toLowerCase();
+
+    const params = new URLSearchParams(query);
+    params.set(key, value);
+    return params.toString();
+  }
+
+  /**
+   * 주어진 쿼리 문자열(query)에서 key에 해당하는 파라미터를 삭제(delete)하고,
+   * 전체 쿼리 문자열을 반환합니다.
+   * @param query  - "a=1&b=2..." 형태의 쿼리 문자열 (맨 앞 ? 는 없어야 합니다)
+   * @param key    - 삭제할 파라미터 이름
+   * @returns      - 삭제된 상태의 새로운 쿼리 문자열
+   */
+  removeQueryParam(query: string, key: string): string {
+    query = query.toLowerCase();
+    key = key.toLowerCase();
+
+    const params = new URLSearchParams(query);
+    params.delete(key);
+    return params.toString();
+  }
+
+  // Headers
+  /**
+   * 주어진 헤더 맵에서 name에 해당하는 첫 번째 헤더 값을 반환합니다.
+   * @param headers     - Response.getHeaders() 가 반환하는 객체
+   * @param name        - 꺼내고 싶은 헤더 이름 (예: "location", "Content-Type")
+   * @returns           - 해당 헤더의 첫 번째 값, 없으면 null
+   */
+  getHeaderValue(
+    headers: Record<string, string | string[]>,
+    name: string
+  ): string | null {
+    const normalized = this.lowerCaseAllHeaders(headers);
+    const target = name.toLowerCase();
+
+    for (const [key, value] of Object.entries(normalized)) {
+      if (key === target) {
+        let rawValue: string | null = null;
+
+        if (Array.isArray(value)) {
+          rawValue = value.length > 0 && value[0] ? value[0] : null;
+        } else {
+          rawValue = value.length > 0 ? value : null;
+        }
+
+        if (rawValue !== null) {
+          try {
+            return decodeURIComponent(rawValue);
+          } catch {
+            return rawValue;
+          }
+        }
+      }
+    }
+
+    return null;
+  }
+
+  /**
+   * 주어진 헤더 맵에서 name에 해당하는 헤더 값을 value로 변경한 새 맵을 반환합니다.
+   * - 기존 헤더 이름의 대소문자를 보존합니다.
+   * - value가 string인 경우 [value] 형태로, string[]인 경우 그대로 사용합니다.
+   * - 기존에 해당 헤더가 없으면 새로 추가합니다.
+   *
+   * @param headers   - 키가 헤더 이름, 값이 문자열 배열인 헤더 맵
+   * @param name      - 변경할 헤더 이름 (예: "Authorization", "X-Custom-Header")
+   * @param value     - 새로 설정할 값 (string 또는 string[])
+   * @returns         - 지정된 헤더가 업데이트된 새로운 헤더 맵
+   */
+  setHeaderValue(
+    headers: Record<string, string | string[]>,
+    name: string,
+    value: string | string[]
+  ): Record<string, string[]> {
+    headers = this.lowerCaseAllHeaders(headers);
+    const lowerName = name.toLowerCase();
+    const newHeaders: Record<string, string[]> = {};
+
+    // 1) 기존 헤더 복사하되, name과 일치하는 항목은 value로 대체
+    for (const [key, vals] of Object.entries(headers)) {
+      if (key.toLowerCase() === lowerName) {
+        newHeaders[key] = Array.isArray(value) ? value : [value];
+      } else {
+        newHeaders[key] = Array.isArray(vals) ? vals : [vals];
+      }
+    }
+
+    // 2) 해당 헤더가 원래 없었다면 새로 추가
+    const exists = Object.keys(newHeaders).some(
+      (k) => k.toLowerCase() === lowerName
+    );
+    if (!exists) {
+      newHeaders[name] = Array.isArray(value) ? value : [value];
+    }
+
+    return newHeaders;
+  }
+
+  /**
+   * 주어진 헤더 맵에서 특정 이름(들)에 해당하는 헤더를 제거한 새 맵을 반환합니다.
+   * @param headers        - 키가 헤더 이름, 값이 문자열 배열인 헤더 맵
+   * @param namesToRemove  - 제거할 헤더 이름(하나 혹은 배열). 대소문자 구분 없이 매칭됩니다.
+   * @returns              - 지정된 헤더가 제외된 새로운 헤더 맵
+   */
+  removeHeaders(
+    headers: Record<string, string | string[]>,
+    namesToRemove: string | string[]
+  ): Record<string, string[]> {
+    headers = this.lowerCaseAllHeaders(headers);
+    const toRemove = Array.isArray(namesToRemove)
+      ? namesToRemove.map((n) => n.toLowerCase())
+      : [namesToRemove.toLowerCase()];
+
+    const filtered: Record<string, string[]> = {};
+    for (const [key, vals] of Object.entries(headers)) {
+      if (!toRemove.includes(key.toLowerCase())) {
+        filtered[key] = Array.isArray(vals) ? vals : [vals];
+      }
+    }
+    return filtered;
+  }
+}
diff --git a/playground/csrf/index.js b/playground/csrf/index.js
new file mode 100644
index 0000000..5c7a733
--- /dev/null
+++ b/playground/csrf/index.js
@@ -0,0 +1,65 @@
+// app.js
+const express = require("express");
+const app = express();
+const port = 8000;
+
+// 콜백 엔드포인트 (정상 동작 시뮬레이션)
+app.get("/callback", (req, res) => {
+  res.send(`
+    <h1>Callback Received</h1>
+    <p>Query Params:</p>
+    <pre>${JSON.stringify(req.query, null, 2)}</pre>
+  `);
+});
+
+/**
+ * 1) state 파라미터를 무시하는 취약한 /authorize 엔드포인트
+ *    - 클라이언트가 state를 보내도 무시
+ *    - 리디렉트 시 state를 포함하지 않음
+ */
+app.get("/authorize/no-state", (req, res) => {
+  const clientId = req.query.client_id || "unknown-client";
+  const redirectUri = encodeURIComponent(
+    req.query.redirect_uri || `http://localhost:${port}/callback`
+  );
+  const code = "authcode-12345";
+
+  // state를 전혀 포함하지 않은 채로 리디렉트
+  const location = `${redirectUri}?code=${code}&client_id=${clientId}`;
+  res.set("Location", location);
+  res.status(302).send(`Redirecting to ${location}`);
+});
+
+/**
+ * 2) 클라이언트가 보낸 state와 다른 값을 넣는 취약한 /authorize 엔드포인트
+ *    - 클라이언트가 보낸 state를 로그로 확인만 하고,
+ *      응답 Location에는 'wrong-state'를 삽입
+ */
+app.get("/authorize/mismatch-state", (req, res) => {
+  const clientId = req.query.client_id || "unknown-client";
+  const originalState = req.query.state;
+  const redirectUri = encodeURIComponent(
+    req.query.redirect_uri || `http://localhost:${port}/callback`
+  );
+  const code = "authcode-67890";
+
+  console.log(`[VULN] original state from client:`, originalState);
+
+  // 클라이언트 state와 다르게 'wrong-state'를 삽입
+  const wrongState = "wrong-state";
+  const location = `${redirectUri}?code=${code}&state=${wrongState}&client_id=${clientId}`;
+  res.set("Location", location);
+  res.status(302).send(`Redirecting to ${location}`);
+});
+
+app.listen(port, () => {
+  console.log(
+    `Vulnerable OAuth test server listening at http://localhost:${port}`
+  );
+  console.log(
+    `1) No-State:       http://localhost:${port}/authorize/no-state?client_id=abc&redirect_uri=http://localhost:${port}/callback`
+  );
+  console.log(
+    `2) Mismatch-State: http://localhost:${port}/authorize/mismatch-state?client_id=abc&state=xyz&redirect_uri=http://localhost:${port}/callback`
+  );
+});
diff --git a/playground/csrf/package-lock.json b/playground/csrf/package-lock.json
new file mode 100644
index 0000000..f924d15
--- /dev/null
+++ b/playground/csrf/package-lock.json
@@ -0,0 +1,1167 @@
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+      "funding": {
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+        "es-errors": "^1.3.0",
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+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3",
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+      },
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+        "url": "https://github.com/sponsors/ljharb"
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+      "license": "MIT",
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+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
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+    },
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+      "dev": true,
+      "license": "ISC",
+      "bin": {
+        "nodetouch": "bin/nodetouch.js"
+      }
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+      "license": "MIT"
+    },
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "license": "ISC"
+    }
+  }
+}
diff --git a/playground/csrf/package.json b/playground/csrf/package.json
new file mode 100644
index 0000000..9c6b2a7
--- /dev/null
+++ b/playground/csrf/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "csrf",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "nodemon index.js"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^5.1.0"
+  },
+  "keywords": [],
+  "description": "",
+  "devDependencies": {
+    "nodemon": "^3.1.10"
+  }
+}
diff --git a/playground/pkce/.gitignore b/playground/pkce/.gitignore
new file mode 100644
index 0000000..a14702c
--- /dev/null
+++ b/playground/pkce/.gitignore
@@ -0,0 +1,34 @@
+# dependencies (bun install)
+node_modules
+
+# output
+out
+dist
+*.tgz
+
+# code coverage
+coverage
+*.lcov
+
+# logs
+logs
+_.log
+report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# caches
+.eslintcache
+.cache
+*.tsbuildinfo
+
+# IntelliJ based IDEs
+.idea
+
+# Finder (MacOS) folder config
+.DS_Store
diff --git a/playground/pkce/README.md b/playground/pkce/README.md
new file mode 100644
index 0000000..4a3109f
--- /dev/null
+++ b/playground/pkce/README.md
@@ -0,0 +1,15 @@
+# playground
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+To run:
+
+```bash
+bun run 
+```
+
+This project was created using `bun init` in bun v1.2.14. [Bun](https://bun.sh) is a fast all-in-one JavaScript runtime.
diff --git a/playground/pkce/bun.lock b/playground/pkce/bun.lock
new file mode 100644
index 0000000..0a70737
--- /dev/null
+++ b/playground/pkce/bun.lock
@@ -0,0 +1,25 @@
+{
+  "lockfileVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "playground",
+      "devDependencies": {
+        "@types/bun": "latest",
+      },
+      "peerDependencies": {
+        "typescript": "^5",
+      },
+    },
+  },
+  "packages": {
+    "@types/bun": ["@types/bun@1.2.14", "", { "dependencies": { "bun-types": "1.2.14" } }, "sha512-VsFZKs8oKHzI7zwvECiAJ5oSorWndIWEVhfbYqZd4HI/45kzW7PN2Rr5biAzvGvRuNmYLSANY+H59ubHq8xw7Q=="],
+
+    "@types/node": ["@types/node@22.15.21", "", { "dependencies": { "undici-types": "~6.21.0" } }, "sha512-EV/37Td6c+MgKAbkcLG6vqZ2zEYHD7bvSrzqqs2RIhbA6w3x+Dqz8MZM3sP6kGTeLrdoOgKZe+Xja7tUB2DNkQ=="],
+
+    "bun-types": ["bun-types@1.2.14", "", { "dependencies": { "@types/node": "*" } }, "sha512-Kuh4Ub28ucMRWeiUUWMHsT9Wcbr4H3kLIO72RZZElSDxSu7vpetRvxIUDUaW6QtaIeixIpm7OXtNnZPf82EzwA=="],
+
+    "typescript": ["typescript@5.8.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-p1diW6TqL9L07nNxvRMM7hMMw4c5XOo/1ibL4aAIGmSAt9slTE1Xgw5KWuof2uTOvCg9BY7ZRi+GaF+7sfgPeQ=="],
+
+    "undici-types": ["undici-types@6.21.0", "", {}, "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ=="],
+  }
+}
diff --git a/playground/pkce/package.json b/playground/pkce/package.json
new file mode 100644
index 0000000..0bbbfb8
--- /dev/null
+++ b/playground/pkce/package.json
@@ -0,0 +1,10 @@
+{
+  "name": "playground",
+  "private": true,
+  "devDependencies": {
+    "@types/bun": "latest"
+  },
+  "peerDependencies": {
+    "typescript": "^5"
+  }
+}
diff --git a/playground/pkce/src/PKCEDowngradeExpress.js b/playground/pkce/src/PKCEDowngradeExpress.js
new file mode 100644
index 0000000..61cf737
--- /dev/null
+++ b/playground/pkce/src/PKCEDowngradeExpress.js
@@ -0,0 +1,31 @@
+const express = require("express");
+const app = express();
+
+app.get("/auth", (req, res) => {
+  const {
+    client_id,
+    response_type,
+    code_challenge,
+    code_challenge_method,
+    scope
+  } = req.query;
+
+  console.log("Incoming request:", req.query);
+
+  if (!client_id || response_type !== "code") {
+    return res.status(400).send("Missing required parameters");
+  }
+
+  // Simulate issuing an authorization code
+  const code = "dummy-auth-code";
+
+  // Simulate PKCE check (normally you'd validate here)
+  // We deliberately allow the downgrade here to simulate the vulnerability
+  const responseBody = `Authorization successful. code=${code}`;
+  return res.status(200).send(responseBody);
+});
+
+const PORT = 5050;
+app.listen(PORT, () => {
+  console.log(`Test PKCE server running on http://localhost:${PORT}`);
+});
diff --git a/playground/pkce/tsconfig.json b/playground/pkce/tsconfig.json
new file mode 100644
index 0000000..bfa0fea
--- /dev/null
+++ b/playground/pkce/tsconfig.json
@@ -0,0 +1,29 @@
+{
+  "compilerOptions": {
+    // Environment setup & latest features
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "Preserve",
+    "moduleDetection": "force",
+    "jsx": "react-jsx",
+    "allowJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedIndexedAccess": true,
+    "noImplicitOverride": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noPropertyAccessFromIndexSignature": false
+  }
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 67de64e..83609d4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -11,6 +11,9 @@ importers:
       '@caido-community/dev':
         specifier: ^0.1.3
         version: 0.1.5(postcss@8.5.3)(typescript@5.5.4)
+      '@caido/sdk-backend':
+        specifier: ^0.48.1
+        version: 0.48.1
       typescript:
         specifier: 5.5.4
         version: 5.5.4
@@ -34,9 +37,15 @@ packages:
   '@caido/quickjs-types@0.17.2':
     resolution: {integrity: sha512-5kcucGORMNEbcdU91yKLYZG/TFDqsO6XmCZ1TnU6V48E61mmqrJg6kjrfOFP1WOugDm+ZcGd/Su3p3XkFXfaPg==}
 
+  '@caido/quickjs-types@0.18.0':
+    resolution: {integrity: sha512-hRXUVdDvlhEhvkBoWWytoVS2j1KDVZa8dx2Q/KvWUQTR57U8EMSYE9iFgvPhu78gS8z+RF42Zcb7moNx4SDMlw==}
+
   '@caido/sdk-backend@0.46.0':
     resolution: {integrity: sha512-peUKW/4Nrw9WVxIahc+6KrVtxA7vsbpuJqOoBxudxq7tQJ+cV9IEqzvYoFFo8KlnrTkeUQUJvd0W4WsM3HgxEg==}
 
+  '@caido/sdk-backend@0.48.1':
+    resolution: {integrity: sha512-JvFeOlSqAKbj3OenBn0LPtCNaOV0x6YtaAQijpvYfBJK32Nvbf924Z10bFVCu+Clc5A1qr7HcAvJ/8B/aRikWA==}
+
   '@caido/sdk-shared@0.1.1':
     resolution: {integrity: sha512-JAV5ajUqxZdXYPTmDEvIKBZon8I5uHq44ATj0Nj3BVpllRDUGY9kcBd+PXMD50+3lv1CvhR3/f6q24T0+4aVJQ==}
 
@@ -1095,11 +1104,18 @@ snapshots:
 
   '@caido/quickjs-types@0.17.2': {}
 
+  '@caido/quickjs-types@0.18.0': {}
+
   '@caido/sdk-backend@0.46.0':
     dependencies:
       '@caido/quickjs-types': 0.17.2
       '@caido/sdk-shared': 0.1.1
 
+  '@caido/sdk-backend@0.48.1':
+    dependencies:
+      '@caido/quickjs-types': 0.18.0
+      '@caido/sdk-shared': 0.1.1
+
   '@caido/sdk-shared@0.1.1': {}
 
   '@esbuild/aix-ppc64@0.24.2':