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+---
+slug: "2026.6.3"
+title: "2026.6.3: Improved security for filter queries"
+---
+
+| Component | Summary (english)                                                                     | Relevance for consumers (English)                                                                                             | Relevance for end users (Dutch)                                                                               | Relevance for system administration (Dutch)                                                                        |
+| --------- | ------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------ |
+| ZRC       | Enforced strict validation for query parameters.                                      | Integrations must only use supported query parameters; unknown parameters now return a 400 response instead of being ignored. | Gebruikers krijgen geen onbedoelde resultaten meer bij foutieve filters, wat de kans op datalekken verkleint. |                                                                                                                    |
+| ZRC       | Expanded audit trail coverage for GET queries with filters rsin and vestigingsnummer. |                                                                                                                               |                                                                                                               | Beheerders krijgen uitgebreidere audittrail-informatie voor onderzoek en monitoring op organisatie-identificaties. |