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CVE-2026-55836

6.8 · MEDIUM

Open Zaak is an open-source data and services layer for Dutch case-oriented working.

Published Oct 16, 2026CWE-200EPSS 0.39%

Overview

CVE-2026-55836 is a medium-severity vulnerability. It was published on October 16, 2026 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/open-zaak/open-zaak/commit/4b23957b55ab792bc2ba1fbc5ce6918881b62ab8GitHubgithub.com/open-zaak/open-zaak/commit/69c78ce2a0edb45bec8809bc2205585c5f8a4054GitHubgithub.com/open-zaak/open-zaak/commit/8acd5e59e0132aa19284bf22f7b3defca279e2ceGitHubgithub.com/open-zaak/open-zaak/releases/tag/1.27.2GitHubgithub.com/open-zaak/open-zaak/releases/tag/1.28.2GitHubgithub.com/open-zaak/open-zaak/releases/tag/1.29.0GitHubgithub.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54GitHubgithub.com/open-zaak/open-zaak/security/advisories/GHSA-x5cj-23hr-5r54

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55836?

CVE-2026-55836 is a medium-severity vulnerability. It was published on October 16, 2026 and has a CVSS 3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2026-55836?

This vulnerability has a CVSS 3.1 base score of 6.8, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55836?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55836?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55836 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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