CVE-2026-55836

MEDIUM 6.8

Open Zaak: Path traversal / arbitrary server-file read via Documenten API document import (bestandspad)

CVSS Score

6.8

EPSS Score

0.0%

EPSS Percentile

0th

Open Zaak is an open-source data and services layer for Dutch case-oriented working. From 1.13.0 until 1.27.2, 1.28.2, and 1.29.0, _import_document_row in src/openzaak/components/documenten/tasks.py uses the attacker-controlled bestandspad CSV field without ensuring that the resolved path remains under IMPORT_DOCUMENTEN_BASE_DIR. A client with an all-authorizations application token can supply an absolute or parent-traversal path to a file readable by the Celery service account. The worker copies that file into document storage, allowing its contents to be retrieved through the normal document download API and exposing server secrets or other private files. This issue is fixed in versions 1.27.2, 1.28.2, and 1.29.0.

CWE	CWE-200
Vendor	open-zaak
Product	open-zaak
Published	Oct 16, 2026
Last Updated	Oct 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

open-zaak / open-zaak

>= 1.13.0, < 1.27.2 >= 1.28.0, < 1.28.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54 github.com: https://github.com/open-zaak/open-zaak/commit/4b23957b55ab792bc2ba1fbc5ce6918881b62ab8 github.com: https://github.com/open-zaak/open-zaak/commit/69c78ce2a0edb45bec8809bc2205585c5f8a4054 github.com: https://github.com/open-zaak/open-zaak/commit/8acd5e59e0132aa19284bf22f7b3defca279e2ce github.com: https://github.com/open-zaak/open-zaak/releases/tag/1.27.2 github.com: https://github.com/open-zaak/open-zaak/releases/tag/1.28.2 github.com: https://github.com/open-zaak/open-zaak/releases/tag/1.29.0