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CVE-2026-55836— Open Zaak: Path traversal / arbitrary server-file read via Documenten API document import (bestandspad)

Quick assessment

Affected
open-zaak open-zaak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Open Zaak 是一个面向荷兰案件处理工作的开源数据与服务层。在版本 1.13.0 至 1.27.2、1.28.2 和 1.29.0 中， 文件中的 函数使用了由攻击者控制的 CSV 字段 ，但未确保解析后的路径仍位于 目录之下。拥有“全部授权”应用令牌的客户端可传入绝对路径或包含父目录遍历（如 ）的路径，指向 Celery 服务账户可读的文件。Celery 工作进程会将该文件复制到文档存储中，攻击者随后可通过正常的文档下载 API 获取其内容，从而泄露服务器密钥或其他私有文件。该问题已在版本 1.27.2、1

CVSS 6.8 · Medium

Affected Version Matrix 2

VendorProduct Version RangeStatus
open-zaak open-zaak >= 1.13.0, < 1.27.2 affected
>= 1.28.0, < 1.28.2 affected
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I. Basic Information for CVE-2026-55836

Vulnerability Information
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Vulnerability Title
Open Zaak: Path traversal / arbitrary server-file read via Documenten API document import (bestandspad)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-zaak open-zaak >= 1.13.0, < 1.27.2 -

II. Public POCs for CVE-2026-55836

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III. Intelligence Information for CVE-2026-55836

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Patches & Fixes for CVE-2026-55836 (3)

Vendor Advisories for CVE-2026-55836 (1)

Vendor Pages for CVE-2026-55836 (2)

IV. Related Vulnerabilities

Same product: open-zaak
Same vendor: open-zaak
Same weakness: CWE-200

V. Comments for CVE-2026-55836

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