- The exploitation of a valid computer session—sometimes also called a session key—to gain unauthorized access to information or services in a computer system. In particular, session hijacking is used to refer to the theft of a cookie used to authenticate a user to a remote server. It has particular relevance to web developers, as the HTTP cookies used to maintain a session on many websites can be easily stolen by an attacker using an intermediary computer or with access to the saved cookies on the victim’s computer. After successfully stealing appropriate session cookies, an adversary might use the “Pass the Cookie” technique to hijack the session. ← Wikipedia
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