What mechanism does a Man-in-the-Browser attack primarily exploit?

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A Man-in-the-Browser (MitB) attack primarily exploits an infected browser. This type of attack occurs when malware is installed into the web browser, allowing the attacker to intercept and manipulate web communications between the victim and the websites they are visiting. The malicious code typically functions as a browser extension or a plugin, operating undetected and modifying the data transmitted without the user's knowledge.

By controlling the browser, the attacker can alter transactions, steal sensitive information such as passwords and banking details, and perform actions on behalf of the user. This highlights the importance of maintaining a secure environment by keeping browsers up to date and using security extensions to detect and prevent such threats.

The other options involve network security and user privileges, which are not directly relevant to the primary mechanism of a Man-in-the-Browser attack; hence they do not accurately define the core exploit of this cybersecurity threat.