“The API Attack Surface Nobody Sees”

November 28, 2025

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Internal APIs Are Publicly Accessible by Mistake

APIs meant for internal use are sometimes exposed due to misconfigured gateways. These endpoints lack auth, rate limits, or monitoring. Attackers scan and exploit them systematically.

Swagger and API Docs Leak Sensitive Paths

Auto-generated documentation reveals internal routes, parameters, and data types. These blueprints simplify attacker recon. Most orgs forget to secure or restrict access to these docs.

BOLA (Broken Object Level Authorization) is Still Common

APIs fail to check if a user owns the object they’re requesting. Simple ID manipulation grants access to other users’ data. It’s one of the most exploited API flaws.

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APIs Trust JWTs Without Verifying the Issuer

APIs often validate token structure but not origin. Attackers generate fake JWTs with matching headers. Unsigned or mis-signed tokens slip through validation layers.

Verb Tunneling and Hidden Methods Bypass Filters

Standard firewalls block GET and POST, but ignore lesser-used HTTP methods. Attackers use methods like DELETE or PATCH to execute logic unintentionally. These vectors go undetected in most logs.

API Keys Are Hardcoded and Exposed in Repos

Developers embed secrets in mobile apps or commit them to GitHub. Once leaked, attackers use them without limit. Key rotation is rare, and revocation takes too long.

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