CVE-2026-82834
Deferred Deferred - Pending Action

Improper Access Control in Doccano Open Source Annotation Tools

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: VulDB

Description
A security flaw has been discovered in Doccano Open Source Annotation Tools for Machine Learning Practitioners and Auto Labeling Pipeline Module to Annotate a Document Automatically up to 1.8.5. This affects the function LabelList of the file /v1/projects/1/category-types of the component Bulk-Delete Endpoint. Performing a manipulation results in improper access controls. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

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Meta Information

Published
2026-08-31
Last Modified
2026-08-31
Generated
2026-09-01
AI Q&A
2026-08-31
EPSS Evaluated
N/A
NVD
CVE-2026-82834
EUVD
EUVD-2026-68748

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
doccano doccano to 1.8.5 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CWE-266 A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor.

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Executive Summary

This vulnerability is an improper access control flaw in Doccano Open Source Annotation Tools up to version 1.8.5. It affects the LabelList function in the Bulk-Delete Endpoint, specifically in the /v1/projects/1/category-types component. The issue allows remote attackers to manipulate the system due to weak access controls.

Detection Guidance

This vulnerability affects Doccano versions up to 1.8.5, specifically the Bulk-Delete Endpoint in the LabelList function. To detect it, check if your Doccano instance is running a vulnerable version (1.8.5 or earlier). Inspect network traffic for unauthorized access attempts to the /v1/projects/1/category-types endpoint. Look for unusual bulk-delete operations or improper access control bypasses in logs.

Impact Analysis

This vulnerability could allow unauthorized users to delete or modify labeled data in Doccano. Since it affects annotation tools used in machine learning pipelines, attackers might alter training datasets, leading to incorrect model outputs or data corruption.

Compliance Impact

This vulnerability involves improper access controls in Doccano up to 1.8.5, allowing unauthorized manipulation of data via the Bulk-Delete Endpoint. Such flaws could lead to unauthorized access or deletion of sensitive data, which may violate GDPR's data integrity and confidentiality requirements or HIPAA's safeguards for protected health information.

Mitigation Strategies

Immediately upgrade Doccano to a version beyond 1.8.5 where the vulnerability is patched. If no patch exists, consider disabling the Bulk-Delete Endpoint in the /v1/projects/1/category-types component until a fix is available.

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