CVE-2026-54657Network attack vectorHinoki check available

Metadata disclosure via unfiltered search querysets

Published Oct 16, 2026 · Updated Oct 16, 2026

Authorization bypass in Open Zaak search APIs allows remote authenticated users to read restricted case and document metadata. ListFilterByAuthorizationsMixin.get_queryset applies authorization filtering only to the list action, leaving POST searches at /zaken/api/v1/zaken/_zoek and /documenten/api/v1/enkelvoudiginformatieobjecten/_zoek unrestricted by the token's authorized types or confidentiality levels. A valid zaken.lezen or documenten.lezen token is required; document searches also require known UUIDs, and document downloads remain separately authorized.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in Open Zaak search APIs allows remote authenticated users to read restricted case and document metadata. ListFilterByAuthorizationsMixin.get_queryset applies authorization filtering only to the list action, leaving POST searches at /zaken/api/v1/zaken/_zoek and /documenten/api/v1/enkelvoudiginformatieobjecten/_zoek unrestricted by the token's authorized types or confidentiality levels. A valid zaken.lezen or documenten.lezen token is required; document searches also require known UUIDs, and document downloads remain separately authorized.

The record

CVE
CVE-2026-54657
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
OpenZaak
Product
Open Zaak
Classifications
CWE-285, CWE-639, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.0.0, < 1.27.2
  2. Affected versionversion=>= 1.28.0, < 1.28.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenZaak · Open Zaakversion=>= 1.0.0, < 1.27.2; version=>= 1.28.0, < 1.28.2

Published CVSS scores

6.5GitHub CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
CWE-639Authorization Bypass Through User-Controlled Key
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

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Technologies

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