A user finds out his personal information were used on a website where he never registered. Which case would be close to this scenario?
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Information Stealth.
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Sensitive Information Disclosure.
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Identity Theft.
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Cross-site scripting by MIME sniffing.
Identity Theft involves using someone's personal information without their permission, typically on websites they never registered with. Information stealth is not a standard security term, Sensitive Information Disclosure refers to exposing data by a system, and XSS by MIME sniffing is a specific browser vulnerability.
Someone's personal information being used to register on a site they never signed up for is the defining scenario of Identity Theft — an attacker impersonates the victim using stolen personal data to create accounts or transact as them. 'Information Stealth' isn't a standard security term (and even if intended as 'information theft', it describes the act of stealing data, not its downstream fraudulent use). Sensitive Information Disclosure describes data being improperly exposed, not misused to impersonate someone. Cross-site scripting by MIME sniffing is an unrelated browser-rendering vulnerability.