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CVE-2026-54657

Open Zaak is an open-source data and services layer for Dutch case-oriented working

Risk score
43/100
CVSS
6.5 v3.1
Exploit chance (30 days)
0.3%
Published
16 Oct 2026

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What to know

What it is
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…
Affected
See advisory
Fix
Upgrade the product to 1.27.2, 1.28.2 or 1.29.0 (whichever matches your release line), or later.
Exploitation
No known exploitation

Why it is Yellow

  • CVSS 6.5 medium

References

Original description

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.

Last activity 16 Oct 2026. Patch Forecast updates every hour.