Introduction
Authentication systems control access.
If they are weak, attackers can take over accounts.
Common Problems
- weak passwords allowed
- no rate limiting
- predictable session tokens
- sessions not expiring
Example
If a system allows unlimited login attempts, attackers can brute-force passwords.
If sessions never expire, stolen cookies can be reused.
What Can Happen
- account takeover
- privilege escalation
- unauthorized access
How It Is Prevented
- strong password policies
- multi-factor authentication
- session expiration
- secure session storage
Why This Matters
Authentication is the first line of defense.
If it fails, everything else becomes exposed.
Conclusion
Secure login systems are critical.
Even small weaknesses can lead to full account compromise.