Identification and Authentication Failures in OWASP Top 10 (original) (raw)

Last Updated : 28 Feb, 2026

Identification and Authentication Failures (A07 in the OWASP Top 10) occur when applications improperly handle user identity verification and session management. When authentication mechanisms are weak or sessions are not securely managed, attackers can compromise user accounts and impersonate legitimate users.

• Happens due to weak password policies and poor session handling
• Includes brute force attacks, credential stuffing, and session hijacking
• Often results from missing MFA and insecure token management
• Can lead to account takeover, data breaches, and identity theft

Common Causes of Authentication Failures

1. Weak Password Policies

• Applications allow short, simple, or common passwords.
• Attackers can easily guess or brute-force them.

2. No Multi-Factor Authentication (MFA)

• Login depends only on username and password.
• If credentials are stolen, attackers gain full access.

3. No Account Lockout Mechanism

• Unlimited login attempts are allowed.
• Attackers perform automated brute-force attacks.

4. Insecure Session Management

• Session IDs are predictable, not invalidated after logout, or stored insecurely.
• Attackers hijack active sessions.

5. Credential Exposure

• Passwords are transmitted without HTTPS or stored insecurely.
• Attackers intercept credentials via MITM attacks.

Real-World Examples

Example 1: Brute Force Attack

• An application allows unlimited login attempts.
• Attackers use automated scripts to try thousands of passwords until one works.

Example 2: Credential Stuffing

• Users reuse passwords across platforms.
• Attackers use leaked credentials from previous breaches to access accounts.

Example 3: Session Hijacking

• Session cookies are not secured with HttpOnly and Secure flags.
• An attacker steals the session cookie via XSS and logs in as the victim.

Impact of Identification and Authentication Failures

Authentication failures can cause serious consequences:

• **Account Takeover – Attackers gain control over user accounts
• **Unauthorized Access – Access to sensitive data or admin panels
• **Identity Theft – Users are impersonated
• **Financial Fraud – Unauthorized transactions occur
• **Compliance Violations – Failure to meet authentication security standards
• **Reputation Damage – Loss of customer trust

How Attackers Exploit Authentication Failures

Attackers focus on weak credentials and insecure session controls.

Brute Force Attacks

• Attackers systematically guess passwords.
• **Example: Trying common passwords like 123456, password, etc.

Credential Stuffing

• Attackers use previously leaked username-password combinations.
• **Example: Using breach data from another website.

Session Hijacking

• Attackers steal session tokens via XSS or network sniffing.
• **Example: Capturing cookies on public Wi-Fi.

Session Fixation

• Attackers force a known session ID before login.
• After authentication, they reuse the same session ID.

Phishing Attacks

• Attackers trick users into revealing credentials through fake login pages.

Prevention of Identification and Authentication Failures

1. Implement Strong Password Policies

• Enforce minimum length and complexity
• Prevent use of common passwords
• Encourage password managers

2. Enable Multi-Factor Authentication (MFA)

• Use OTP, biometrics, or hardware tokens
• Add additional verification beyond passwords

3. Protect Against Brute Force

• Implement account lockout policies
• Use CAPTCHA
• Apply rate limiting

4. Secure Session Management

• Use secure, random session IDs
• Set HttpOnly and Secure flags on cookies
• Invalidate sessions after logout
• Regenerate session IDs after login

5. Enforce HTTPS Everywhere

• Use TLS encryption
• Protect credentials during transmission