{secure Deserialization, listed as A08 in the OWASP Top 10 for 2017, occurs when untrusted data is used to reconstruct objects in an application, allowing attackers to manipulate serialized data to execute code, tamper with objects, or escalate privileges. This risk arises when applications blindly trust incoming data and use unsafe deserialization methods. Successful exploitation can lead to remote code execution or access control bypass. To prevent this, avoid deserializing data from untrusted sources, implement integrity checks, and use formats like JSON instead of native binary serialization when possible.