A financial services web application currently keeps authenticated user sessions active indefinitely unless the user explicitly logs out. From a security perspective, which of the following statements BEST describes the implications of this design decision?
It increases the risk of session hijacking because an attacker could reuse an unattended active session.
It is acceptable provided the session cookie is at least 256 bits long and marked Secure and HttpOnly.
It improves security because fewer reauthentication attempts are required, reducing password exposure.
It has no significant security impact as long as HTTPS is used to encrypt the session traffic.
Allowing sessions to remain active without an inactivity timeout exposes the application to session hijacking and unauthorized use of unattended sessions. Industry guidance such as NIST SP 800-63B and the OWASP Session Management Cheat Sheet recommend enforcing idle and absolute session-expiration limits and terminating sessions when users have been inactive for a defined period. Implementing these time-outs shortens the window of opportunity for attackers, whereas simply lengthening the session ID or relying solely on HTTPS does not adequately address the risk.
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Identity and Access Management (IAM)
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