Vulnerability Remediation Guide
Developer-focused remediation guidance with code examples in multiple languages. Fix vulnerabilities the right way, the first time.
Injection
CRITICALInjection
SQL, Command, LDAP injection prevention with parameterized queries.
Authentication
CRITICALAuthentication
Secure password storage, session management, MFA implementation.
XSS
HIGHXSS
Output encoding, CSP headers, DOM sanitization techniques.
Security Headers
MEDIUMSecurity Headers
HSTS, CSP, X-Frame-Options, and other protective headers.
CSRF
HIGHCSRF
Anti-CSRF tokens, SameSite cookies, origin validation.
SSRF
CRITICALSSRF
URL allowlists, IP validation, cloud metadata protection.
File Upload
CRITICALFile Upload
File type validation, safe storage, malware scanning.
Access Control
CRITICALAccess Control
RBAC, ABAC, IDOR prevention, authorization patterns.
XXE
CRITICALXXE
XML External Entity prevention and secure parser configuration.
Deserialization
CRITICALDeserialization
Insecure deserialization prevention with safe alternatives.
Path Traversal
HIGHPath Traversal
Directory traversal prevention with path validation.
Open Redirect
MEDIUMOpen Redirect
URL validation and allowlists to prevent phishing.
Race Conditions
HIGHRace Conditions
TOCTOU prevention, atomic operations, locking strategies.
Memory Safety
CRITICALMemory Safety
Buffer overflows, use-after-free, safe coding practices.
Cryptography
CRITICALCryptography
Modern algorithms, key management, secure RNG, TLS 1.2+.
Logging & Monitoring
MEDIUMLogging & Monitoring
Log injection prevention, sensitive data redaction, SIEM.
Quick Start for Developers
Each guide includes:
- Vulnerable code examples - What NOT to do
- Secure implementations - Copy-paste ready fixes
- Multiple languages - Python, JavaScript, Java, C#, PHP, Go
- Testing commands - Verify your fix works
- Common mistakes - Avoid incomplete fixes
📋 Quick Reference Table
| Vulnerability | Severity | OWASP | CWE | Primary Fix | Secondary Controls |
|---|---|---|---|---|---|
| SQL Injection | CRITICAL | A03 | 89 | Parameterized queries | Input validation, WAF, least privilege DB |
| Command Injection | CRITICAL | A03 | 78 | Avoid shell, use APIs | Input validation, sandboxing |
| XSS | HIGH | A03 | 79 | Output encoding | CSP headers, input validation |
| CSRF | HIGH | A01 | 352 | CSRF tokens | SameSite cookies, origin validation |
| SSRF | CRITICAL | A10 | 918 | Allowlist hosts | Disable redirects, validate responses |
| File Upload | CRITICAL | A04 | 434 | Validate content | Rename files, separate domain, AV scan |
| Access Control | CRITICAL | A01 | 284 | Authorization checks | RBAC/ABAC, audit logging |
| XXE | CRITICAL | A05 | 611 | Disable external entities | Use JSON, less complex parsers |
| Deserialization | CRITICAL | A08 | 502 | Use safe formats (JSON) | Type allowlists, integrity checks |
| Path Traversal | HIGH | A01 | 22 | Canonicalize paths | Allowlist files, chroot |
| Open Redirect | MEDIUM | A01 | 601 | Allowlist domains | Indirect references, relative paths |
| Weak Auth | CRITICAL | A07 | 287 | Strong hash (bcrypt) | MFA, breach checks, rate limiting |
| Race Conditions | HIGH | A04 | 362 | Atomic operations | Locking, transactions, state machines |
| Memory Safety | CRITICAL | A06 | 119 | Use safe languages | Bounds checking, smart pointers, sanitizers |
| Weak Crypto | CRITICAL | A02 | 327 | Modern algorithms | Key management, secure RNG, TLS 1.2+ |
| Log Injection | MEDIUM | A09 | 117 | Sanitize inputs | Structured logging, redact sensitive data |
One-Liner Cheatsheet
Use prepared statements with bound parametersEncode output based on context (HTML/JS/URL)Token per session + SameSite=Strict cookiesAllowlist domains + block private IPs (10.x, 169.254.x)Disable DTDs and external entities in parserNever deserialize untrusted data, use JSONCanonicalize path + verify within allowed directoryParse URL, validate host against allowlistbcrypt(12+) + MFA + rate limiting + breach checkContent validation + random name + isolated storageEssential Security Headers
Content-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
Referrer-Policy: strict-origin-when-cross-origin
Permissions-Policy: geolocation=(), camera=(), microphone=()