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OWASP Top 10 2026

OWASP Top 10 2026

OWASP Top 10 2026

OWASP Top 10 2026

OWASP Top 10 2026

OWASP Top 10 2026

OWASP Top 10 2026

OWASP Top 10 2026

OWASP Top 10 2026

OWASP Top 10 2026 Overview

The OWASP Top 10 represents the most critical web application security risks. The 2026 edition introduces several new categories reflecting the evolving threat landscape.

Updated Categories

A01: Broken Access Control

Access control failures remain the top risk. Modern applications must enforce server-side checks:

// Server-side access control middleware

function requireRole(...roles) {

return (req, res, next) => {

if (!req.user || !roles.includes(req.user.role)) {

// Log the attempt

securityLog.warn("Unauthorized access attempt", {

user: req.user?.id,

path: req.path,

ip: req.ip

});

return res.status(403).json({ error: "Insufficient permissions" });

}

next();

};

}

// Usage

app.get("/api/admin/users", requireRole("admin"), adminController.getUsers);

A02: Cryptographic Failures

Weak cryptography is increasingly exploited. Use modern algorithms:

from cryptography.hazmat.primitives.ciphers.aead import AESGCM

import os

def encrypt_data(data, key):

aesgcm = AESGCM(key)

nonce = os.urandom(12)

ciphertext = aesgcm.encrypt(nonce, data.encode(), None)

return nonce + ciphertext

def decrypt_data(encrypted, key):

aesgcm = AESGCM(key)

nonce = encrypted[:12]

ciphertext = encrypted[12:]

return aesgcm.decrypt(nonce, ciphertext, None).decode()

A03: Injection

Injection remains prevalent. Parameterized queries are mandatory:

Secure: Parameterized query

def find_user(email):

query = "SELECT * FROM users WHERE email = $1"

return db.execute(query, [email])

Also secure: ORM abstraction

def find_user_safe(email):

---

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