Top 235 IDOR Bug Bounty Reports

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What is IDOR?

IDOR, or Insecure Direct Object Reference, is a security flaw that allows attackers to access unauthorized data by manipulating references to objects. This vulnerability arises when an application fails to implement proper access controls, enabling users to retrieve or modify sensitive information they shouldn’t have access to.

For example, consider a URL like this:
https://example.com/account.php?id=24
This request retrieves data for the user with ID 24. However, if an attacker changes the id parameter to 11 (https://example.com/account.php?id=11) and gains access to another user’s data, this is a classic IDOR vulnerability.

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Types of IDOR Vulnerabilities

IDOR vulnerabilities can manifest in various forms, each with its own implications:

1. Blind IDOR: The attacker cannot directly see the results of their actions in the server response. For example, modifying another user’s private data without confirmation.
2. Generic IDOR: The attacker can directly observe the results of their actions, such as accessing another user’s confidential information.
3. IDOR with Reference to Objects: Unauthorized access to objects like bank accounts or user profiles by manipulating reference IDs.
   Example: example.com/accounts?id={reference ID}
4. IDOR with Reference to Files: Unauthorized access to files stored on the server.
   Example: A chat server storing logs as example.com/1.log, example.com/2.log, etc., which can be accessed sequentially.

How to Find IDOR Vulnerabilities

Identifying IDOR vulnerabilities requires a systematic approach:

1. Monitor Requests: Capture all requests sent by your browser to the server. Look for parameters in URLs, headers, or cookies that reference objects or files.
2. Decode Values: Often, IDs are encoded or hashed. Use tools to decode these values (e.g., MD5…