Security regression testing

What security regression testing means after deploys

Security regression testing is not a full assessment every time code ships. It is a focused check on the workflows most likely to drift during releases: authentication, authorization, redirects, callback flows, route exposure, and error handling.

Good triggers for a post-deploy run

• a release that touched auth or session code
• new routes or changed route guards
• callback or OAuth changes
• middleware updates
• API response changes on sensitive endpoints

Suggested regression sequence

Check authentication boundaries

Confirm that protected routes still enforce the expected session and role requirements.

Check routing and callback behavior

Review redirects, callback paths, and state transitions that commonly break after deploys.

Check response shape and cache controls

Look for unexpected data leakage, verbose errors, or cache behavior that changed with the release.

Keep the comparison artifacts

Regression testing is strongest when the new run can be compared with the previous known-good baseline.

Why teams use a local runner here

For post-deploy testing, speed matters. A local runner can keep the browser state, request traces, and export bundle tied to the same run so engineering can review the result without reconstructing what happened from scattered tools.

Keep it narrow

The highest-value regression runs are the narrow ones. Pick the flows tied to the deploy, confirm the evidence, export the result, and only widen the workflow if the first pass finds signal.