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  • “Replay & Reuse: When Old Sessions Become New Threats”

“Replay & Reuse: When Old Sessions Become New Threats”

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Session Tokens Are Stolen and Replayed Without Detection

Attackers hijack active session cookies from browsers or memory. These tokens bypass login and MFA completely. Many systems lack replay detection or session uniqueness.

OAuth Tokens Grant Long-Term Access Without Alerts

OAuth credentials can last weeks or months, often with broad permissions. Compromised tokens go unnoticed unless revoked manually. APIs trust these tokens too blindly.

API Keys Are Reused Across Projects Without Rotation

Developers copy the same keys across apps, scripts, or repos. Once leaked, the same key grants access to multiple systems. Few teams enforce key expiration or scope limits.

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QR Code Logins Can Be Spoofed and Reused

QR login links allow easy sign-in from mobile, but they carry embedded session secrets. These links can be intercepted, reused, or phished. Most apps lack expiration or rate limits on them.

Forgotten Access Tokens Survive Account Deletion

Revoking a user doesn’t always kill their associated tokens. Background processes, integrations, or apps still function. Attackers use these zombie tokens to re-enter quietly.

Legacy Authentication Flows Accept Replay by Design

Old SSO flows and legacy protocols weren’t built with modern threat models. They accept repeated credentials or stale handshakes. Attackers exploit them in automated campaigns.

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