CVE-2026-54657 Missing authorization in open-zaak
Attackers with valid tokens can retrieve unauthorized case or document metadata due to missing authorization filtering in search endpoints.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54657?
CVE-2026-54657 is a medium-severity missing authorization vulnerability in open-zaak, published on 16 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-54657?
How do I fix CVE-2026-54657?
No fix has been published for CVE-2026-54657 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-54657 being exploited?
There is no known exploitation of CVE-2026-54657 in the wild and no public exploit code.
Sources
Also known as GHSA-f29q-7rpr-jmjx.