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What Is Man-in-the-Middle (MITM)?

Man-in-the-Middle (MITM) — an attack in which an adversary secretly intercepts and may alter communication between parties that believe they are connected directly.

The vulnerability arises when an application trusts unvalidated input, a request, a traffic source, or a network channel. Impact depends on the attack surface and can include code execution, session theft, data modification, or denial of service.

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Popular Questions About Man-in-the-Middle (MITM)

  • What does Man-in-the-Middle (MITM) mean?

    Man-in-the-Middle (MITM) — an attack in which an adversary secretly intercepts and may alter communication between parties that believe they are connected directly.

  • How does the attack happen?

    An attacker crafts data or traffic so an application, browser, database, or user performs an unintended action. The exact path depends on the vulnerability type.

  • How can the risk be reduced?

    Use input validation and contextual output encoding, parameterized queries, session protection, least privilege, updates, rate controls, a WAF, and monitoring. No single filter replaces secure development.

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