From customer support chat to database deletion: following the tools in a PortSwigger Web LLM lab.

Understanding private networking, HTTPS, OAuth 2.0, API keys, workload identity, and mutual TLS (mTLS) for secure enterprise API…

Broken Object Level Authorization — IDOR, to most of us — is the single most common serious bug in modern APIs. It sits at #1 on the OWASP…

Valid credentials do not guarantee that a request is safe.

Cuándo revalidar el token detrás del gateway, cómo se llaman las APIs entre sí, introspección o validación local, logout y cuánto debe…

The thinking behind each find, not just the payloads.

In the previous post, I looked at how REST APIs are designed: addresses, HTTP methods and status codes. But there is a question I haven’t…

Master API security in 2026 with 7 essential protections against data breaches, broken access controls, injection attacks, and API abuse.

API security is essential for protecting sensitive data, preventing unauthorized access, and maintaining reliable digital services…

Railway told every user to roll their secrets. A separate leak-site post claims a huge PingCAP/TiDB Cloud theft. One is a vendor…

Most teams are wiring Claude to their systems with duct tape, or not at all. Here is how to build an MCP connector that survives…

A compromised LiteLLM release stole provider keys this week, and a new tool called Alter Vault argues agents should never see credentials…

Where DPoP is now the default, where it falls short, and how to choose.

I recently finished a security assessment of a multi-tenant SaaS platform with an integrated LLM assistant. Final rating: Critical. 17…

Modül II — Klasik Authentication

A cross-account authorization flaw hidden inside a preference endpoint

An API key is often treated as a small configuration detail.

Logs help teams debug workflows, but they can also become an accidental secret store.

OpenCode’s breach last week exposed provider keys that users had saved in its web console. This is where a pasted key ends up, and four…

Picture an organization with a WAF, a valid TLS certificate and a yearly penetration test that still finds its customer data on a public…