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OWASP Top 10 2026: Critical Web Security Every Developer Must Know

SynfraCore·February 2026·10 min read

Why Every Developer Must Know This

The OWASP Top 10 is the most referenced web application security list. Every security audit, penetration test, and compliance framework references it. If you write web applications, you are responsible for preventing these.

1. Broken Access Control (Most Critical)

python

# VULNERABLE
@app.route('/api/users/<int:user_id>')
def get_user(user_id):
    return db.get_user(user_id)  # no ownership check!

# SECURE
@app.route('/api/users/<int:user_id>')
@login_required
def get_user(user_id):
    if current_user.id != user_id and not current_user.is_admin:
        abort(403)
    return db.get_user(user_id)

2. SQL Injection

python

# VULNERABLE — never do this
query = f"SELECT * FROM users WHERE name = '{user_input}'"

# SAFE — parameterised queries
cursor.execute('SELECT * FROM users WHERE name = %s', (user_input,))

3. Cryptographic Failures

python

# WRONG — MD5 is crackable in seconds
hash = md5(password).hexdigest()

# CORRECT — bcrypt with work factor
from bcrypt import hashpw, gensalt
hashed = hashpw(password.encode(), gensalt(rounds=12))

4-10 Summary

#4 Insecure Design: Missing rate limiting, no account lockout.

#5 Misconfiguration: Default passwords, verbose errors.

#6 Vulnerable Components: pip audit, npm audit, Dependabot.

#7 Auth Failures: Implement MFA. Secure password reset.

#8 Integrity Failures: Verify CI/CD artifacts.

#9 Logging Failures: Log all auth events, alert on anomalies.

#10 SSRF: Validate URLs your server fetches from user input.

See Security Academy for hands-on labs.

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