Exploit for Use of Function with Inconsistent Implementations in Google Chrome

## https://sploitus.com/exploit?id=BF1EE5C8-03F6-593B-9370-A24FF7DDAEA0
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## CVE-2026-11102 – OAuth2 Implicit Grant Fragment Hijacking

### Program Code (Node.js + Exploit)

```javascript
// oauth_server.js - OAuth2 provider issuing tokens in fragment
const express = require('express');
const app = express();

app.get('/authorize', (req, res) => {
    const redirectUri = req.query.redirect_uri;
    const state = req.query.state || '';
    // Simulate user approval: redirect with access token in fragment
    const token = 'secret_access_token';
    res.redirect(`${redirectUri}#access_token=${token}&state=${state}`);
});

app.listen(3000, () => console.log('OAuth server on :3000'));

```

# CVE-2026-11102 – OAuth2 Implicit Grant Fragment Hijacking

![Severity: Critical](https://img.shields.io/badge/severity-critical-red)

## Overview
An OAuth2 provider implements the implicit grant flow without validating the `redirect_uri` against a whitelist. An attacker can supply a malicious URI and, after the user authenticates, the access token is leaked via the URL fragment to the attacker’s page.

## Vulnerability Details
- **Type:** Insecure Direct Object Reference / Redirect URI Validation
- **Impact:** Account takeover via stolen access token.
- **Root Cause:** The authorization server does not validate that the `redirect_uri` exactly matches a pre-registered value, allowing redirection to an attacker-controlled domain.

## Exploit Demonstration
1. Start the OAuth server:
   ```bash
   npm install express
   node oauth_server.js
2. Run the exploit:
   ```bash
   python exploit_fragment_hijack.py