API security risks expose the limits of key-based access controls

At a glance

What this is: This article explains why API security risks remain high when organisations depend on API keys, tokens, encryption, and rotation controls that do not fully govern machine-to-machine access.

Why it matters: It matters because IAM, PAM, and NHI programmes have to treat API access as a governed identity surface, not just a transport or application-layer issue.

By the numbers:

• As per the State of Developer Experience report released in 2023, 98% of developers perceive APIs as crucial in aiding their and their team’s productivity.
• Secrets rotation should be automatically done at least every 90 days.

Context

API security risks arise when machine-to-machine access is treated as a simple key problem instead of a full identity and governance problem. The article ties API usage to authentication, authorization, encryption, endpoint exposure, and secret lifecycle controls, all of which can fail independently.

The primary identity issue is not whether APIs exist, but whether the credentials and permissions behind them are governed with the same discipline applied to human access. For IAM and NHI teams, APIs are a control surface where weak lifecycle management and poor policy enforcement can turn ordinary integrations into standing risk.

Key questions

Q: What breaks when customer-owned API keys are not lifecycle-managed?

A: When customer-owned API keys are not lifecycle-managed, access can persist after ownership changes, business relationships shift, or a workflow is retired. In a compliance stack, that creates lingering authority over screening and case handling. The result is preventable exposure in a regulated process, plus weak evidence when audit teams ask who controlled what and when.

Q: Why do exposed APIs create risk even when TLS is enabled?

A: TLS protects traffic in transit, but it does not fix broken authorization, insecure object references, or overly broad permissions. An endpoint can still be abused if the caller is valid but under-governed. Security teams therefore need both transport protection and access checks that verify what the caller may reach, not just whether the connection is encrypted.

Q: How can security teams tell whether API risk controls are actually working?

A: Look for reduced abuse volume, fewer successful automated attacks, and clearer visibility into which non-human clients are making requests and why. If the control is effective, suspicious traffic should be slowed, challenged, or blocked before it reaches core systems, while legitimate integrations continue to function normally.

Q: Should organisations prioritise secret rotation or access review first

A: They should do both, but access review should come first when unknown or over-privileged identities already exist. Rotation reduces exposure window, but review reduces entitlement sprawl and clarifies ownership. If a team rotates secrets without fixing who can use them, it preserves the same risk pattern with a fresher credential.

Technical breakdown

Why API keys and tokens are not enough

API keys, OAuth tokens, and JWTs are authentication artefacts, but they do not by themselves establish safe authorisation boundaries. In practice, many API risks come from assuming possession of a token equals legitimacy, when the real issue is whether the token is bound to the right scope, lifecycle, and transport protections. Without strong policy enforcement, a valid credential can still reach sensitive objects, privileged functions, or exposed endpoints. That is why API security is as much an access-control problem as it is an application-security problem.

Practical implication: treat API credentials as governed identities and validate scope, expiry, and access boundaries continuously.

How exposed endpoints and insecure data flow create abuse paths

An unprotected endpoint is not only an availability risk; it is an identity shortcut that lets attackers or unauthorised systems bypass intended control paths. The article points to insecure data exposure, lack of encryption, and insecure direct object references as distinct weaknesses that often stack together. HTTPS protects data in transit, but it does not fix broken authorisation, weak object-level checks, or missing rate limits. In other words, transport security and access governance solve different problems and both are needed.

Practical implication: review endpoints for broken authorization and object access, not just for TLS deployment.

Why secrets rotation and scanning matter in API governance

API security is not static because API keys and tokens can be copied, logged, exposed in code, or reused after business context changes. The article stresses automatic rotation every 90 days and secret scanners that detect API keys or JWTs before publication. That reflects a core NHI reality: long-lived credentials create reuse windows that are hard to observe once they leave the original system. Rotation, revocation, and detection must therefore work together rather than as isolated tasks.

Practical implication: build secret scanning and rotation into release, logging, and offboarding workflows.

Threat narrative

Attacker objective: The attacker wants to use trusted API access paths to reach data or functions that were never meant to be exposed.

1. Entry occurs when an attacker or unauthorised caller reaches an exposed API endpoint or obtains a valid API key, token, or JWT from a weakly governed system.
2. Credential abuse follows when that credential is accepted without sufficient authorisation checks, object-level controls, or scope validation.
3. Escalation happens through insecure data exposure, missing encryption, insecure direct object references, or overly permissive access policies that widen what the caller can reach.
4. Impact is unauthorised access to sensitive data, manipulated requests, service disruption, or broader abuse of trusted machine-to-machine workflows.

Breaches seen in the wild

• McHire default password flaw 2025: A forgotten test admin account with the password 123456 and an API flaw exposed McDonald's McHire applicant records to researchers.
• Firebase misconfiguration exposure 2024: Missing Firebase security rules on 916 websites exposed 125 million user records and 19.87 million plaintext passwords; a quarter were fixed.

Read our 52 NHI Breaches Analysis report for a comprehensive view of breaches impacting Non-Human Identities including AI Agents.

NHI Mgmt Group analysis

API security risk is really identity governance risk at machine scale. The article shows that API keys, tokens, TLS, and rate limiting each solve only part of the problem. When the caller is a system rather than a person, the control set has to cover issuance, scope, rotation, revocation, and endpoint authorization as one lifecycle.

Standing credential exposure is the hidden failure mode in most API programmes. API access often persists far beyond the business context that created it, which makes leaked or reused keys especially dangerous. That is why secrets management is not a support function here, it is the governance layer that determines whether API trust remains current.

Key-based access control breaks down when authorisation is separated from context. The article implicitly shows that possession-based authentication cannot express who should reach which object, under which condition, and for how long. Practitioners should read this as a signal that API governance must move from static access grants to continuously governed identity scope.

API security is now a cross-domain control problem, not a point solution problem. The same API surface touches appsec, IAM, NHI lifecycle, logging, and exposure management. That means teams that separate these ownership domains will keep finding the same issue from different angles. The practical conclusion is that API governance needs shared ownership across security, platform, and identity teams.

Ephemeral access without lifecycle control becomes trust debt. Short-lived tokens can reduce blast radius, but they do not eliminate the need to know who issued them, where they are used, and how they are revoked. In identity terms, the control objective is not just shorter duration, it is tighter governance of machine trust end to end.

From our research library:

• Secrets management is a top five cybersecurity priority for only 33% of organisations, behind cloud security (45%), API security (42%), and endpoint security (36%), according to the 2024 State of Secrets Management Survey.
• Read next: API Key Management Guide

What this signals

API key controls need a lifecycle, not a static policy. The article’s most useful signal for practitioners is that encryption, validation, and rate limiting are necessary but not sufficient if credentials remain reusable long after the business need changes. That is where NHI governance and API governance converge: ownership, expiry, and revocation become part of the control plane, not a back-office task.

Key-based trust creates hidden blast radius. Once a token or key is shared across services, it becomes difficult to know which integrations still depend on it and which ones can be revoked safely. Security teams should expect API governance to drift unless secret scanning, ownership review, and lifecycle enforcement are tied to deployment and offboarding.

API security risk is increasingly a machine identity problem. As APIs proliferate, so do the non-human credentials behind them. That means NHI programmes should treat API access paths as first-class identities and align their governance with workload identity, secret rotation, and authorization review.

For practitioners

• Audit API credential lifecycle Inventory keys, tokens, and JWTs across code, CI pipelines, logs, and runtime services, then map each one to an owner, expiry, and revocation path.
• Enforce object-level authorization Review every sensitive endpoint for broken object references and ensure the caller can only reach the specific resource it is entitled to access.
• Automate rotation and revocation Set a hard maximum lifetime for API secrets, rotate them on a fixed schedule, and revoke any credential that appears in scanning results or audit anomalies.
• Separate transport security from access control Use HTTPS everywhere, but do not treat encryption as a substitute for authorization checks, rate limits, or request validation.
• Add governance for shadow APIs Require approved creation, ownership, and usage rules for partner and internal APIs so that undocumented endpoints do not bypass normal review.

Key takeaways

• API security fails when teams treat keys and tokens as sufficient proof of trust instead of governed machine identities.
• The article reinforces a hard rotation expectation by stating that API secrets should be rotated automatically at least every 90 days.
• The practical fix is to align endpoint authorization, transport encryption, secret lifecycle management, and monitoring under one ownership model.

Key terms

• API Key: A unique identifier used to authenticate a software application or service when calling an API. API keys are static, long-lived credentials and a major source of secrets sprawl. In 2024, over 50 million leaked API keys were found on the dark web.
• Object Level Authorization: Object level authorization controls access to individual records or resources, not just to an endpoint. It prevents users from reaching data that is technically available through a route but should remain hidden according to policy, role, or ownership. This is a key safeguard against broken access control.
• Secrets Rotation: Secrets rotation is the practice of replacing credentials on a schedule or after an event so exposed values stop working quickly. In NHI programmes, rotation must be tied to ownership and automation, otherwise credentials remain valid long after teams believe the risk has been addressed.
• Shadow API: An API endpoint that exists in production but is not fully known, reviewed, or governed by the security programme. Shadow APIs often emerge through fast delivery, copy-paste development, or overlooked internal routes, and they create untracked exposure because they sit outside inventory, policy, and ownership processes.

Deepen your knowledge

NHI governance, machine identity security, and secrets management are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building or maturing an IAM programme, it is worth exploring.