Four Common Django OTP Security Flaws That Only Appear in Production

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A technical analysis published on DEV Community identifies four critical security mistakes developers commonly make when implementing OTP verification in Django applications. The first flaw involves using Python's random module instead of the cryptographically secure secrets module, which can make generated codes predictable under certain conditions. Without dedicated rate-limiting throttles, attackers can brute-force all one million possible six-digit combinations within minutes, while sharing throttle scopes with login endpoints can silently exhaust a user's OTP quota. OTP codes should be assigned a short expiry window and invalidated immediately upon successful verification to prevent replay attacks. A fourth production-only bug arises when OTP data is stored in process memory rather than a shared database, causing multi-worker server setups like Gunicorn to fail verification for valid codes routed to different worker processes.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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