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api/bootstrap.php's centralized CSRF handling echoes CsrfMiddleware::getToken() on a 403 rejection specifically so lt.api's client-side resync (assets/js/base.js) can recover once window.CSRF_TOKEN goes stale (token expiry, or a write in another tab rotating the shared session-scoped token). 12 endpoints duplicate CsrfMiddleware::validateToken() inline instead of routing through bootstrap.php, and their 403 body omitted csrf_token entirely — custom_fields.php, clone_ticket.php, delete_comment.php, delete_attachment.php, bulk_operation.php, generate_api_key.php, manage_templates.php, manage_recurring.php, revoke_api_key.php, manage_workflows.php, ticket_dependencies.php, and upload_attachment.php. Once a client's token drifted out of sync, the next write to any of these 12 endpoints returned a 403 with no way to self-heal — every subsequent write to any endpoint kept failing until a manual reload, since the resync mechanism was only wired up on a minority of the app's write surface. Took the minimal fix the issue names as sufficient (add 'csrf_token' => CsrfMiddleware::getToken() to each rejection body) rather than restructuring all 12 through bootstrap.php, to avoid behavioral risk from rewiring each endpoint's differing auth/bootstrapping. generate_api_key.php and revoke_api_key.php threw a generic Exception for this case (swallowed into a plain error-message response with no room for extra fields), so those two now short-circuit with a direct JSON response instead, matching the other 10. Verified end-to-end against real running endpoints with a real session and real MariaDB: sent a wrong CSRF token to one endpoint of each response shape (plain json_encode, ResponseHelper::error, and the formerly exception-based path) and confirmed all three now return the current valid csrf_token in the 403 body. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Lhz7pGMaoTfL5sdYS5XiKv