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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallA customer opens an invoice, changes an account setting, or requests a text message. Behind that ordinary action, an API may pass data between the business’s website, software, payment service, or another provider. The danger is not simply that an API exists or is reachable: it is whether the right caller can access the right record and action, whether exposed endpoints are still needed, and whether requests are kept within safe limits.
What is an API, and why might a flaw be hard to see?
An application programming interface (API) is a way for software systems to exchange data or request actions. A website might use one to retrieve an invoice; a mobile app might use one to update a profile; a business system might call a provider to send a text. These exchanges can happen behind the screen, so an owner may not know which APIs are in use or which system is responsible for them.
APIs can be customer-facing, partner-facing, or internal. OWASP notes that they may expose application logic and sensitive information such as personally identifiable information. That does not make every public API unsafe. The important questions are what it permits, how it verifies permissions, and whether its configuration and limits match the business’s intent. OWASP API Security Project
How can an API flaw affect a small business?
The examples below are illustrative scenarios, not reports of specific incidents. They show how the risk categories in the OWASP API Security Top 10 – 2023 can appear in everyday business workflows.
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A customer can access another customer’s record
If an API accepts a record identifier supplied by a user—such as an invoice number—it must check whether that user is allowed to access that particular record. A login only establishes an identity; it does not automatically grant access to every customer’s data. Broken object-level authorization can occur when the API retrieves the requested record without checking that relationship.
A user can reach a staff-only action or change a protected field
Authorization must also apply to operations and individual data fields. A customer should not be able to invoke an administrative function simply because it is reachable, or modify a field that the customer is not entitled to change. OWASP identifies broken function-level and object-property authorization as distinct risks: one concerns which actions a caller can perform; the other concerns which properties they can read or alter.
A former API version or debug endpoint remains reachable
A website update does not necessarily remove an older API version or an endpoint used for troubleshooting. If those interfaces remain exposed without a current business need and appropriate protections, they can create paths that the organization no longer expects to be available. OWASP highlights security misconfiguration and improper API inventory management, including deprecated versions and debug endpoints.
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Repeated requests consume paid services or disrupt operations
An API call can trigger work and incur a cost. For example, an automated stream of requests might repeatedly invoke a paid SMS or email service. OWASP’s unrestricted-resource-consumption category covers risks that include denial of service and increased operating costs when APIs or connected services are used excessively.
An integration supplies data the business did not expect
Data from another API should not automatically be treated as trustworthy. An integration can return unexpected or malformed information, and OWASP cautions that developers may trust data from other APIs more than ordinary user input. The business impact depends on what the receiving system does with that data.
A legitimate workflow is automated excessively
Some API risks involve how a feature is used rather than a conventional coding defect. A workflow that is reasonable when a person uses it occasionally may harm the business if automated at high volume—for example, by consuming limited capacity or triggering repeated business actions. OWASP describes this as a sensitive business flow risk.
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How can a business find out which APIs it uses?
Start with the systems and people that operate the business’s websites, applications, and integrations. Ask each provider or developer for an up-to-date inventory of API hosts, endpoints or services, versions, and owners. Include APIs used by business-to-business connections and internal systems, not only those visible to customers.
Then compare the inventory with what the business actually needs. CISA’s Internet Exposure Reduction Guidance, published June 4, 2025, recommends identifying internet-exposed assets, deciding which need to remain accessible, restricting unnecessary exposure, and mitigating risks on the systems that remain exposed. CISA Internet Exposure Reduction Guidance
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How can a small business reduce API risk?
There is no single control that addresses every API risk. NIST’s SP 800-228, Guidelines for API Protection for Cloud-Native Systems, describes risk analysis and protections at both pre-runtime and runtime stages, with an incremental approach based on risk. The NIST page notes updates as of March 13, 2026, including appendices on API risks by category and recommended controls by lifecycle stage.
- Get an inventory and assign owners. Ask website, software, and integration providers to identify APIs, hosts, versions, and the person or team responsible for each.
- Check permissions at the record and action level. Confirm that the API verifies whether a caller may access the specific record requested and perform the specific operation—not merely whether the caller has logged in.
- Limit fields to what each workflow needs. Review which data clients can read and which properties they can change. Avoid returning sensitive fields or accepting client changes that a workflow does not require.
- Set limits where requests trigger costs or actions. Put sensible request and abuse limits around workflows that call paid services or carry out business operations, and watch for unusual patterns or failures.
- Remove exposure that has no current purpose. Retire deprecated API versions and debug endpoints, address default credentials, and restrict internet access where it is not needed.
- Handle integration data as untrusted input. Review what third-party APIs return and how the receiving application validates and uses it.
- Reassess after changes. Revisit inventory, permissions, and limits when software, providers, integrations, or business workflows change.
These steps draw on OWASP’s risk categories and NIST and CISA guidance; they are practical starting points, not a complete audit standard or a guarantee of security.
When should you ask for an API security assessment?
Consider help from a qualified application-security consultant or your software provider if you cannot establish a reliable API inventory, if customer or payment data is involved, or if your team cannot verify authorization and runtime controls. An assessment is most useful when its scope is explicit: it should identify the APIs and versions covered, examine access to individual records and functions, review configuration and exposed endpoints, and explain how findings will be handled as systems change.
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If you are comparing in-house work, a managed API gateway, or an outside assessment, compare coverage of the inventory, authorization testing, fit with your hosting model, runtime visibility and response, implementation effort, recurring cost, and who owns updates. NIST discusses multiple implementation options and their trade-offs; the best fit depends on the organization’s risks and systems, not on a universal product choice.
Questions to ask your developer or provider
- Which APIs and versions does our business use, and who owns each one?
- How does each API check access to the specific customer record and operation requested?
- Which fields can customers read or change, and how is that limited?
- Are old versions, debug interfaces, or unnecessary public endpoints still reachable?
- What limits and monitoring apply to API calls that trigger paid services or business actions?
- How are data returned by third-party APIs validated?
- What changes trigger a review of the inventory, permissions, and protections?
The official sources reviewed do not establish a measured API breach rate specifically for small businesses. OWASP’s Top 10 describes categories of risk, not the share or frequency of incidents, so it should be used to understand possible failure modes rather than to infer how often they happen.
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