Application Cybersecurity Expertise
Cybersecurity in 2026, a matter of business continuity
In 2025, the average cost of a data breach in Europe crossed 4.9 million euros according to the IBM Cost of a Data Breach report. The full entry into force of NIS 2 in October 2024 and of DORA in January 2025 extended security obligations to thousands of French companies, with penalties that can reach 10 million euros or 2% of worldwide turnover. Cybersecurity is no longer a checkbox, it is a prerequisite for business continuity.
Most incidents observed in our portfolio in 2025 stem from avoidable application flaws: poorly designed access control (OWASP A01), hardcoded secrets, outdated dependencies, non-existent logging. Our boutique applies the OWASP, ANSSI and ISO 27001 frameworks to your PHP applications and infrastructure, with a methodology of grey-box pentest, security-oriented code review and systematic server hardening.
Our approach
Security at YDH is not an annual audit. It is a discipline integrated into the development cycle.
- STRIDE threat modeling from scoping. We map threats (Spoofing, Tampering, Repudiation, Information disclosure, Denial of service, Elevation of privilege) on critical flows before writing a single line of code.
- Security by design, not security by audit. Authentication, authorization, logging, secrets management are defined in week 1. No painful retrofit six months later.
- Annual grey-box pentest as a minimum. Restricted access to code and a user account, OWASP Testing Guide v5 methodology, report with reproducible proofs of concept and CVSS 3.1 scoring.
- Automated and manual code review. Psalm Taint Analysis, PHPStan security extensions, composer audit in CI, plus targeted human review on sensitive points (authentication, external I/O, deserialization).
- Centralized secrets management. HashiCorp Vault or AWS Secrets Manager, automated rotation, no secret in persistent environment variables, no secret in clear in code or versioned configuration files.
- Logging and detection. Monolog dedicated security channel, correlation via SIEM (Wazuh, Elastic Security), alerting on known attack patterns (brute force, enumeration, injection).
Technologies & frameworks we master
| Area | Tools and methodologies |
|---|---|
| Frameworks | OWASP Top 10 2025, OWASP ASVS 4, OWASP Testing Guide v5, ANSSI PA-022, CIS Benchmarks |
| Compliance | GDPR (art. 32), ISO 27001:2022, ISO 27017, ISO 27018, SOC 2 Type II, NIS 2, DORA, HDS |
| Static analysis | PHPStan + security extensions, Psalm TaintAnalysis, Semgrep, Snyk Code, SonarQube |
| Dependency scan | Composer audit, Snyk, Dependabot, Trivy (Docker images), Grype |
| Application pentest | OWASP ZAP 2.15, Burp Suite Pro, Nuclei, sqlmap, ffuf, nikto, Wapiti |
| Authentication | Symfony Security 7, argon2id, WebAuthn, TOTP, OAuth2, OpenID Connect, SSO SAML 2 |
| Secrets management | HashiCorp Vault, AWS Secrets Manager, Doppler, Azure Key Vault, sealed-secrets |
| Hardening | Nginx + ModSecurity, CSP level 3, SELinux, AppArmor, fail2ban, CrowdSec |
| Security observability | Wazuh, Elastic Security, Sentry, Datadog Security Monitoring |
| TLS & network | TLS 1.3 only, OCSP stapling, HSTS preload, mTLS, WireGuard, Cloudflare Zero Trust |
Related services
Our cybersecurity engagements span several catalogue services.
- Cybersecurity — pentest, hardening, secrets management, compliance.
- Technical audits — security track included, CVSS, OWASP Top 10 item by item.
- DevOps & infrastructure — secure CI/CD, image scanning, encrypted secrets, RBAC policy.
- Managed cloud hosting — managed hosting with patching, 24/7 monitoring, tested DRP.
- Migration & modernization — exiting critical-CVE dependencies, end of PHP 7.
Typical use cases
Preparing an ISO 27001 certification. Gap analysis against the 2022 standard, rollout of missing technical controls (A.8 access management, A.14 development security), policy drafting, support through the initial audit.
Annual pentest on a B2B SaaS platform. Grey-box test over 15 days, OWASP ASVS level 2 methodology, focus on multi-tenant isolation, report with 22 CVSS-prioritized findings, 3-month remediation plan.
NIS 2 compliance. Applicability analysis, mapping of essential and important systems, rollout of a 24-hour incident notification procedure, team training on detection and reporting.
Managing a post-breach security incident. Application forensics (logs, PHP-FPM memory dumps), vulnerability identification, immediate remediation, CNIL notification within 72 hours, post-mortem and preventive hardening of the stack.
Cyber-specific FAQ
Is an OWASP Top 10 audit enough for GDPR compliance? No. OWASP Top 10 covers the most frequent technical vulnerabilities, but GDPR also requires a processing register, an impact assessment (DPIA) when needed, procedures to handle individuals' rights and a retention policy. Our approach combines both, with a unified deliverable.
Black-box or grey-box pentest? Grey-box (a pentester with a standard user account and optionally code access) delivers a far better price-to-quality ratio. In 5 to 10 days, we find 80% of the business vulnerabilities that a black-box test would take weeks to surface, or miss completely. We reserve black-box for APT simulations on mature infrastructures.
Should all sensitive database columns be encrypted? Not necessarily. At-rest encryption at the disk level (LUKS, AWS EBS) covers physical theft. Application-level encryption (via Sodium or AWS KMS) is reserved for ultra-sensitive data (argon2id-hashed passwords, API tokens, health data under HDS). Too much application-level encryption kills search and indexing.
How do I manage secrets in a CI/CD pipeline? Never in plain GitHub/GitLab environment variables. We use OIDC to obtain ephemeral AWS or GCP credentials at job start, Vault for application secrets, and fine-grained scopes on API tokens. Automated rotation, leak scanning via gitleaks or trufflehog on every PR.
What is the difference between a pentest and a security audit? Pentest simulates the attack: we try to break the application. A security audit examines configuration, code and processes: we verify controls exist. Both are complementary. Ideally, one annual audit plus one annual pentest, run by different teams for cross-review.
Further reading
Our technical publications dive into these topics.
- OWASP Top 10 2025: concrete implementation with Symfony 7 — category-by-category guide, Symfony code, pre-production checklist.
- Migrating a PHP 5.6 legacy to 8.3 with the strangler pattern — exiting critical CVEs without a big bang.
- RAG in production with pgvector, Claude and Symfony — prompt security, PII, LLM guardrails.
Get in touch
An audit to trigger, a certification to prepare, an ongoing incident? Write to contact@your-digital-hub.com or use our contact page. For a critical incident, use "SECURITY EMERGENCY" in the subject, reply within 4 business hours.