API Surface Discovery

What is API Surface Discovery?

Identifies exposed API endpoints, GraphQL introspection, Swagger/OpenAPI documentation, and API versioning.

This vulnerability class falls under the Cryptography phase of the OWASP Testing Guide (WSTG-INFO). Security engineers prioritise cryptography checks early in an assessment because weaknesses here provide a foothold that amplifies the severity of vulnerabilities found in later phases.

Security Impact

Exposed API docs reveal your entire backend structure. This module maps publicly-accessible API attack surface.

Left undetected, api surface discovery issues can persist unnoticed for months. Continuous automated scanning ensures your team receives an alert the moment a regression or new exposure is introduced — long before an attacker discovers it through manual enumeration or automated offensive tooling.

How DygDog Detects It

DygDog passively fingerprints the target by inspecting publicly reachable assets, response headers, DNS records, and indexed content — no active probing that could alert IDS/WAF systems.

The API Surface Discovery check is implemented as a passive scan module, meaning it never sends dangerous payloads or modifies application state. Scans complete in approximately 2.2 s and run continuously in the background so your security posture reflects the current state of your site — not a point-in-time snapshot.

Remediation Approach

Limit what search engines and passive observers can reach by tightening robots.txt directives, removing unnecessary meta-data from responses, and disabling directory listing on all web server configurations.

DygDog does not stop at detection. When a API Surface Discovery finding is confirmed, the platform generates infrastructure-aware, copy-paste-ready remediation snippets using frontier AI models. Instead of generic advice you need to adapt, you receive code that targets your exact server, framework, and configuration.

OWASP References

This check maps to the following OWASP Testing Guide test cases:

• WSTG-INFO-06View OWASP WSTG →

Related Cryptography Checks

These checks belong to the same testing phase and are often assessed together:

• Email Authentication (SPF/DMARC)

  Validates SPF, DKIM, and DMARC DNS records for email spoofing protection.

• DNS Security (CAA/DNSSEC)

  Checks DNS CAA records for certificate authority restrictions and DNSSEC deployment status.

• CVE/EPSS Threat Intelligence

  Enriches findings with NVD CVSS scores, FIRST EPSS exploit probability, and CISA KEV status.

• Supply Chain Vulnerability Check

  Cross-references detected libraries against OSV.dev for known vulnerabilities in dependencies.