Token Theft
Token Theft is an attack where an attacker steals authentication or authorization tokens, which can then be used to impersonate the token's legitimate owner. Tokens can be stolen from memory, logs, network traffic, or local storage.
# WHAT TEAMS RUN INTO
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Tokens are valuable targets. An attacker who steals a token has immediate access without needing to guess passwords. Tokens are especially valuable if they have long expiration times or are used across multiple systems.
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Token theft is hard to detect in real time. Stolen tokens look like legitimate use — the attacker is using valid tokens, just not from the legitimate owner. Detection requires comparing token behavior to expected behavior.
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Token revocation is not instant. If a token is stolen, the legitimate owner doesn't know to revoke it until they discover the theft. Revocation lists must be checked on every access, and checking happens only if systems are configured to do so.
# WHY IT MATTERS
Tokens are the lifeblood of modern authentication. When tokens are compromised, attackers gain access without needing passwords or MFA. Organizations that protect tokens carefully — using short expiration times, securing them in transit, and monitoring for unusual token usage — make token theft less valuable. Organizations that are careless with tokens guarantee that token theft will be a successful attack vector.