Regression Tests for the Laravel TokenGuard Patch Keep the Authentication Bypass Closed
The article explains how to write regression tests that ensure the CVE-2026-114509 fix in Laravel's TokenGuard remains in place after deployment. The vulnerability involves non-string JSON credentials reaching the user lookup on MySQL, and the patched guard now rejects such values with an is_string() check before querying the provider. The recommended approach combines unit tests with a synthetic provider, integration tests on MySQL or MariaDB, and HTTP-level tests on a disposable application. It also calls for a version matrix covering the patched releases, pinned dependencies, and a non-affected database as a control. Together these layers guard against regressions from vendor changes, copied custom guards, or dependency updates.
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