---
id: CVE-2026-55836
title: >-
  Open Zaak: Path traversal / arbitrary server-file read via Documenten API
  document import (bestandspad)
summary: >-
  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
  bestandsp…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-200
vendor: open-zaak
product: open-zaak
affected:
  - 'open-zaak >= 1.13.0, < 1.27.2'
  - 'open-zaak >= 1.28.0, < 1.28.2'
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T16:01:07.670750Z'
exploitAvailable: true
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T16:01:37.738Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-55836'
references:
  - url: >-
      https://github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54
    label: >-
      https://github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54
  - url: >-
      https://github.com/open-zaak/open-zaak/commit/4b23957b55ab792bc2ba1fbc5ce6918881b62ab8
    label: >-
      https://github.com/open-zaak/open-zaak/commit/4b23957b55ab792bc2ba1fbc5ce6918881b62ab8
  - url: >-
      https://github.com/open-zaak/open-zaak/commit/69c78ce2a0edb45bec8809bc2205585c5f8a4054
    label: >-
      https://github.com/open-zaak/open-zaak/commit/69c78ce2a0edb45bec8809bc2205585c5f8a4054
  - url: >-
      https://github.com/open-zaak/open-zaak/commit/8acd5e59e0132aa19284bf22f7b3defca279e2ce
    label: >-
      https://github.com/open-zaak/open-zaak/commit/8acd5e59e0132aa19284bf22f7b3defca279e2ce
  - url: 'https://github.com/open-zaak/open-zaak/releases/tag/1.27.2'
    label: 'https://github.com/open-zaak/open-zaak/releases/tag/1.27.2'
  - url: 'https://github.com/open-zaak/open-zaak/releases/tag/1.28.2'
    label: 'https://github.com/open-zaak/open-zaak/releases/tag/1.28.2'
  - url: 'https://github.com/open-zaak/open-zaak/releases/tag/1.29.0'
    label: 'https://github.com/open-zaak/open-zaak/releases/tag/1.29.0'
tags:
  - cve.org
  - exploit-available
ingestedAt: '2026-10-16T17:24:46.881Z'
---

## Overview

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.

## Affected

- `open-zaak >= 1.13.0, < 1.27.2`
- `open-zaak >= 1.28.0, < 1.28.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.