Security vulnerabilities and automated fixes for spring security issues
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A high-severity security flaw in Halo's `PersistentTokenBasedRememberMeServices` allowed stolen remember-me tokens to remain permanently valid — even after expiration was detected. The vulnerable implementation explicitly documented that expired tokens would *not* be removed from storage, meaning an attacker who stole a cookie could retain access indefinitely. The fix ensures expired tokens are immediately deleted from storage the moment they are detected, closing a persistent backdoor.