CVE-2026-55836 json
Open Zaak: Path traversal / arbitrary server-file read via Documenten API document import (bestandspad)
published 2026-10-16 23 d ago modified 2026-10-16 23 d ago also EUVD-2026-102900
- cvss
- 6.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
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 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.
Patch / fix
- github.com/open-zaak/open-zaak@4b23957 commit
- github.com/open-zaak/open-zaak@69c78ce commit
- github.com/open-zaak/open-zaak@8acd5e5 commit
- github.com/open-zaak/open-zaak/releases/tag/1.27.2 release
- github.com/open-zaak/open-zaak/releases/tag/1.28.2 release
- github.com/open-zaak/open-zaak/releases/tag/1.29.0 release
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 23 d ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N |
Affected products
- open-zaak open-zaak
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
References
- github.com /open-zaak/open-zaak/commit/4b23957b55ab792bc2ba1fbc5ce6918881b62ab8
- github.com /open-zaak/open-zaak/commit/69c78ce2a0edb45bec8809bc2205585c5f8a4054
- github.com /open-zaak/open-zaak/commit/8acd5e59e0132aa19284bf22f7b3defca279e2ce
-
github.com
/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54
exploit
- github.com /open-zaak/open-zaak/releases/tag/1.27.2
- github.com /open-zaak/open-zaak/releases/tag/1.28.2
- github.com /open-zaak/open-zaak/releases/tag/1.29.0
Sources
- CVE List CVE-2026-55836
- NVD CVE-2026-55836
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.