For regulated industries, API security testing has to produce repeatable, dated evidence and cover authorization logic, not only known vulnerability patterns. Look for an API inventory, tests mapped to the OWASP API Top 10, results you can export, and a clear statement of what automation cannot find.
Why is authorization the center of it?
The OWASP API Security Top 10 for 2023 leads with authorization: broken object level authorization, broken authentication, broken object property level authorization, and broken function level authorization all appear in the list. The rest include unrestricted resource consumption, unrestricted access to sensitive business flows, server side request forgery, security misconfiguration, improper inventory management and unsafe consumption of APIs.
Authorization bugs depend on your business rules. A scanner can check that an endpoint rejects a request with no token. It struggles to know that user A should not read user B's invoice. That is why regulated teams pair automated tests with targeted manual review and with tests written around their own data model.
What should a buyer look for?
- Inventory. Improper inventory management is its own category on the list. A tool that finds only the APIs you already know about leaves the shadow and old versions untested.
- Coverage of the list. Ask which of the ten categories are tested automatically, which partly, and which not at all.
- Authenticated testing. Can it run as multiple users with different roles and compare responses?
- Safe scope. For production or regulated data, testing should be scoped to verified targets and use test data.
- Evidence. Dated reports, tickets and retest results that map to a control. Regulators and customers ask for these.
- CI fit. Can a lighter test run on every pull request, with the deeper test on a schedule?
- Data handling. Where do requests and responses go? Can it run on your infrastructure?
What are the honest limits?
Automated API testing finds missing authentication, common injection patterns, misconfigurations and exposed documentation. It is weaker on business logic flaws, chained abuse of legitimate features, and rules that exist only in your product owner's head.
Static analysis of the code adds some coverage, since SAST output points to file and line, though OWASP notes such tools have trouble with authentication flaws and access control problems. Treat each method as a partial view.
What does regulated evidence look like?
Keep, for each test cycle: the scope and date, the API inventory used, the tests run and the roles tested, the findings with severity, the fixes and the retest result. Link these to your change records. Safeguard's compliance automation can map results to control language, and the evidence still needs your owner's review.
If your sector is subject to specific rules, such as health, payments or financial reporting, check which controls require periodic testing and at what depth. Ask your assessor rather than guessing.
What to do
- Build an API inventory from gateway logs, code and cloud config, not from memory.
- Rank APIs by the data they expose and the regulation that applies.
- Write authorization tests for the top ones, using at least two roles.
- Run automated tests in CI and a deeper scheduled scan on verified targets.
- Budget for a manual review of business logic on your highest risk flows.
- Store dated reports and retest results for each cycle.
- Retire old API versions and record that you did.
Quick check
Is a scanner enough for an audit?
It supplies part of the evidence. Auditors usually also want an inventory, a process for fixing findings and proof you retested.
Which OWASP item should we test first?
Start with broken object level authorization. It is first on the 2023 list, and it is common wherever IDs appear in URLs or bodies.
Sources
Last reviewed: 18 October 2026.
