Use Cases / Shadow & Zombie API Detection
Use Case

Shadow & Zombie API Detection

Identify undocumented, forgotten, deprecated or low/no-traffic APIs that remain reachable.

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ReachabilityExploitabilityBusiness impact
What this covers

Find the API that survived its documentation, owner or intended retirement.

Shadow and zombie APIs remain dangerous because the normal controls have moved on while the endpoint is still reachable.

01

Distinguish shadow from zombie

  • Shadow APIs are active but absent from the governed catalogue.
  • Zombie APIs are deprecated or replaced but remain reachable.
  • Both can retain old authentication, data schemas and infrastructure long after the current service changes.
02

How ThreatCanary finds them

  • Compare external discovery and observed behaviour with specifications, gateways and repositories.
  • Use historical route and service observations to identify endpoints that should have disappeared.
  • Correlate domains, versions, owners and downstream services before testing.
03

What gets validated

  • Whether the route accepts unauthenticated or weaker-authorised requests.
  • Whether legacy behaviour exposes sensitive data or functions.
  • Whether the endpoint bypasses controls enforced by its replacement.
04

Evidence delivered

  • Discovery source, history and ownership confidence.
  • Side-by-side control behaviour for current and legacy routes.
  • A retirement or remediation test that can be verified after the change.
Common questions

Questions teams ask before they commit.

Direct answers on scope, evidence, safety controls and how ThreatCanary differs from tools you already run.

01

What is a shadow API?

A shadow API is an endpoint that exists and is reachable but is undocumented or operating outside governance — commonly deployed without being registered in any inventory or specification. It is a security concern because controls, monitoring and testing are generally applied to the documented API estate, so shadow endpoints receive none of them.

02

What is a zombie API?

A zombie API is a deprecated, forgotten or superseded endpoint that remains reachable after it was meant to be retired. Zombie APIs often run older code, older authentication logic or older data-handling behaviour than their replacements, and because nobody expects them to be live they are rarely patched or monitored.

03

How does ThreatCanary find undocumented APIs?

Discovery draws on API gateways, OpenAPI specifications, logs, source repositories and exposed services, so it is not limited to what is documented. OSINT and leak detection additionally monitors public sources for exposed API specifications, leaked secrets and developer artefacts, correlating those clues against internal inventory to surface endpoints that were never registered.

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