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A01 Broken Access Control and IDOR
A01 Broken Access Control and IDOR Broken access control is the #1 web risk: a user does or sees things they should not. IDOR is the classic case: changing an ID in a URL to read someone else’s data. /invoice?id=1001 → change to 1002 → you see another user’s invoice, because the server did not check
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What this card says
What it is
Broken access control is the #1 web risk: a user does or sees things they should not.
IDOR is the classic case: changing an ID in a URL to read someone else’s data.
Example
/invoice?id=1001 → change to 1002 → you see another user’s invoice, because the server did not check who owns it.
Why it matters for security
Check ownership on the server for every request.
Hiding a button is not access control.
Learn more in the lesson: 29.5 A01 Broken Access Control and IDOR