Some systems display information using just a number in the URL.
For example:

site.com/profile/120

If someone changes the number to:

site.com/profile/121

and another user’s account appears, this means the site is not properly verifying access permissions.

🔐 This vulnerability is known as IDOR (Insecure Direct Object Reference). It occurs when a system allows access to data based solely on an ID, without checking whether the user is authorized to view it.

Therefore, permissions must always be verified before displaying any data to a user.

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