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):
return User.query.filter_by(email=email).first()
A04: Insecure Design
A new emphasis on design-level flaws:
threat_modeling_checklist:
- Are trust boundaries defined?
- Is there a data flow diagram?
- Are failure modes handled?
- Is there rate limiting on auth endpoints?
- Are security controls centralized?
A07: Identification and Authentication Failures
Passwordless and MFA are now expected baselines:
// WebAuthn registration
async function registerPasskey(userId) {
const credential = await navigator.credentials.create({
publicKey: {
challenge: new Uint8Array(32),
rp: { name: "Example Corp" },
user: {
id: new TextEncoder().encode(userId),
name: userId,
displayName: userId
},
pubKeyCredParams: [{ alg: -7, type: "public-key" }]
}
});
return credential;
}
A08: Software and Data Integrity Failures
CI/CD pipeline security and supply chain attacks:
# Supply chain security checks
supply_chain_checks:
- Verify package signatures
- Scan dependencies for known vulnerabilities
- Pin dependency versions
- Use private registries for verified packages
- Sign all releases with cosign
Testing Approaches
Modern testing combines automation and manual review:
def security_test_suite():
results = []
# 1. Automated DAST
results.extend(run_dast_scan("https://staging.example.com"))
# 2. SAST scan
results.extend(run_sast_scan("./src"))
# 3. Dependency check
results.extend(run_dependency_check("./package.json"))
# 4. API fuzzing
results.extend(api_fuzz("https://staging.example.com/api"))
return analyze_results(results)
Conclusion
The OWASP Top 10 2026 reflects the maturing security landscape. Broken access control remains king, but supply chain security and design flaws have rightfully gained prominence. Adapt your testing approach to cover all categories and integrate security throughout the development lifecycle.