{"id":"CVE-2026-55551","published":"2026-10-30T17:17:25.647","lastModified":"2026-10-30T19:39:14.897","description":"ZAC is an open-source, workflow-based Common Ground component for Dutch municipal case management. Prior to 5.2.0, by-id read endpoints in `src/main/kotlin/nl/info/zac/app/zaak/ZaakRestService.kt` omit `assertPolicy`(`policyService.readZaakRechten(zaak).lezen`) authorization. `RequestAuthorizationFilter` and `hasAnyApplicationRole` require only an application role on any zaaktype, not the target case's type, while `zaak-rechten.rego` enforces the actual `zaaktype_allowed` boundary only when invoked. An authenticated low-privileged municipal user who knows a case or decision UUID can use `GET /rest/zaken/besluit/zaakUuid/{uuid}` (`listBesluitenForZaakUUID`) to read decisions including types, dates, and free-text toelichting; `GET /rest/zaken/besluit/{uuid}/historie` (`listBesluitHistorie`) to read audit old/new values; and `GET /rest/zaken/{uuid}/process-diagram` (`downloadProcessDiagram`) to read BPMN workflow state across unauthorized zaaktypes. The advisory also identifies `zaak/{uuid}/afzender` (`listAfzendersVoorZaak`) as exposing zaaktype mailbox configuration without a policy check. The search/_zoek path is correctly authorization-filtered and is not part of this by-id read cluster. This issue is fixed in version 5.2.0.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-285","CWE-639"],"vendors":[],"products":[],"references":[{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/commit/7b90586be658cec9fa5c98c0838636237f40931f","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/commit/d050f247301a1bcfb867015725a693c540a06f5a","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/pull/6225","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/pull/6229","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/releases/tag/v5.2.0","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/security/advisories/GHSA-cv9m-35q4-cxfm","tags":[]}],"exploitRefs":[{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/commit/7b90586be658cec9fa5c98c0838636237f40931f","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/commit/d050f247301a1bcfb867015725a693c540a06f5a","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/pull/6225","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/pull/6229","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/releases/tag/v5.2.0","tags":[]},{"url":"https://github.com/infonl/dimpact-zaakafhandelcomponent/security/advisories/GHSA-cv9m-35q4-cxfm","tags":[]}],"hasPoc":true,"ai":null}