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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55836
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-16 16:18:43 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionOpen 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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

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

Problem Types: CWE-200 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Open-zaak Open-zaak affected >= 1.13.0, < 1.27.2 Not specified
CNA Open-zaak Open-zaak affected >= 1.28.0, < 1.28.2 Not specified

References

ReferenceSourceLinkTags
github.com/open-zaak/open-zaak/releases/tag/1.27.2 [email protected] github.com
github.com/open-zaak/open-zaak/releases/tag/1.29.0 [email protected] github.com
github.com/open-zaak/open-zaak/releases/tag/1.28.2 [email protected] github.com
github.com/open-zaak/open-zaak/commit/8acd5e59e0132aa19284bf22f7b3defca2... [email protected] github.com
github.com/open-zaak/open-zaak/commit/69c78ce2a0edb45bec8809bc2205585c5f... [email protected] github.com
github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/open-zaak/open-zaak/commit/4b23957b55ab792bc2ba1fbc5ce6918881... [email protected] github.com
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