CVE-2026-54657
MediumCVSS 6.5Summary
In Open Zaak from 1.0.0 until 1.27.2, 1.28.2, and 1.29.0, the POST search endpoints /zaken/api/v1/zaken/_zoek and /documenten/api/v1/enkelvoudiginformatieobjecten/_zoek do not filter result querysets according to the authorizations associated with the request token. A caller with a valid zaken.lezen or documenten.lezen token can retrieve case or document metadata outside the token's authorized types or confidentiality levels.
Risk Assessment
An attacker with a valid read token can obtain case or document metadata they are not authorized to access, constituting an access control violation and information leak.
Recommendation
Update Open Zaak to version 1.27.2, 1.28.2, or 1.29.0 (or later), which fix this vulnerability.
Other vulnerabilities in Open Zaak
Original NVD description (English source)
Open Zaak is an open-source data and services layer for Dutch case-oriented working. From 1.0.0 until 1.27.2, 1.28.2, and 1.29.0, the POST search endpoints /zaken/api/v1/zaken/_zoek and /documenten/api/v1/enkelvoudiginformatieobjecten/_zoek do not filter result querysets according to the authorizations associated with the request token. A caller with a valid zaken.lezen or documenten.lezen token can therefore retrieve case or document metadata outside the token's authorized types or confidentiality levels. Document searches require known UUIDs, and document content remains protected by separate download authorization. This issue is fixed in versions 1.27.2, 1.28.2, and 1.29.0.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS