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CWE - 639 : Access Control Bypass Through User-Controlled Key

CWE Definition http://cwe.mitre.org/data/definitions/639.html
Number of vulnerabilities: 22
Description The system's access control functionality does not prevent one user from gaining access to another user's records by modifying the key value identifying the record.Retrieval of a user record occurs in the system based on some key value that is under user control. The key would typically identify a user related record stored in the system and would be used to lookup that record for presentation to the user. It is likely that an attacker would have to be an authenticated user in the system. However, the authorization process would not properly check the data access operation to ensure that the authenticated user performing the operation has sufficient entitlements to perform the requested data access, hence bypassing any other authorization checks present in the system. One manifestation of this weakness would be if a system used sequential or otherwise easily guessable session ids that would allow one user to easily switch to another user's session and view/modify their data.
Background Details
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