CVE-2026-55836
MediumCVSS 6.8Summary
In Open Zaak from 1.13.0 until 1.27.2, 1.28.2, and 1.29.0, _import_document_row uses the attacker-controlled bestandspad CSV field without ensuring 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 copy any readable file into document storage.
Risk Assessment
An attacker can expose server secrets or other private files through the normal document download API, resulting in leakage of confidential data.
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 1.13.0 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS