Exposed API Key? What to Do After a Secret Leak

Is the exposed API key actually a secret?

Not every key in a browser is confidential. Some services provide publishable keys intended for client applications, while privileged secret keys belong on controlled backend systems. The distinction depends on the provider and permissions, not how complicated the string looks.

For example, Supabase distinguishes publishable and secret keys. Publishable keys are designed for public components with appropriate data-access policies; secret keys provide elevated access. A visible publishable key is not, by itself, proof of a secret leak. Incorrect permissions can still expose data.

Identify the service, environment, owner and permitted actions without copying the full value into a ticket or chat. If the key grants production access, record which resources are reachable and whether it can read, write or administer them. That determines the response priority.

Contain access and plan API key rotation

For a confirmed active secret, coordinate with the service owner immediately. If there is active abuse, contain access without waiting for a perfect migration. Where a short controlled replacement is appropriate, identify dependent services, move them to a new credential and revoke the old one promptly. Follow the provider's procedure and verify that revocation took effect.

GitHub's sensitive-data removal guidance puts revocation or rotation before repository cleanup. Rewriting history cannot erase every copy in another person's clone or fork. An old value must stop granting access even if someone retained it.

Keep the replacement out of the original leak path. Supabase's rotation guide explicitly calls for fixing that cause and prioritizing immediate retirement during active misuse. Provider details vary, so creating a new key alone should never be treated as proof that the old one is disabled.

Review what the leaked key could reach

Build a short incident record while the relevant evidence is available. Separate capability from observed activity: a key that can read customer files creates a serious exposure, but claiming files were stolen requires supporting evidence.

OWASP's Secrets Management Cheat Sheet covers auditing, revocation and the secret lifecycle. Use available audit evidence to understand the event, and record gaps explicitly. An absence of suspicious entries is less reassuring when the affected operation was never logged.

Fix the frontend or configuration path that exposed it

Imagine a hypothetical reporting portal that accidentally includes a privileged document-service token in its frontend build. Replacing that token in the same frontend variable would publish the new credential on the next deployment. The review must follow the value from configuration to the downloadable asset.

The intended design might move privileged document retrieval to a server route that checks the current user's permission for the requested report. Test that route as part of the fix: moving a secret to the server does not help if the new route will fetch any document for anyone.

Sectiv can help scope an application exposure assessment around questions like these: what is publicly reachable, what a configured identity can do and which permission boundary needs verification. The result should connect the visible exposure to reproducible application behavior. Incident response and provider-side recovery requirements should be agreed separately.

Verify the fix before closing the alert

For the reporting portal, closure needs several observations: the old token is inactive, the new build does not expose a replacement, legitimate report downloads still work and unauthorized accounts cannot use the server route. Record the deployed version and the results, with sensitive values redacted.

Then add a check at the point that failed. If the problem came from build configuration, reviewing only repository source will miss part of the issue. Give credentials named owners and appropriately narrow permissions, and review where they can enter output, logs or test fixtures. Secret scanning is useful detection; the response still needs someone responsible for acting on it.

Get a clearer view of your application's exposure

If an exposed key raised questions about the rest of your application, bring the affected workflow and a redacted incident summary to Sectiv. We can discuss a focused web and API assessment, the access it requires and the evidence your engineering team needs. Keep live secrets out of the booking form; the first conversation is about scope and next steps.