onyx-dot-app Onyx up to 4.2.x User Group Management ee/onyx/db/user_group.py update_user_group/add_users_to_user_group privileges management

Summaryinfo

A vulnerability described as problematic has been identified in onyx-dot-app Onyx up to 4.2.x. This impacts the function update_user_group/add_users_to_user_group of the file ee/onyx/db/user_group.py of the component User Group Management. Such manipulation leads to privileges management. This vulnerability is documented as CVE-2026-63178. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in onyx-dot-app Onyx up to 4.2.x. Affected by this issue is the function update_user_group/add_users_to_user_group of the file ee/onyx/db/user_group.py of the component User Group Management. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Onyx is an open-source AI platform. Prior to 4.3.0, Onyx Enterprise Edition's PATCH /manage/admin/user-group/{user_group_id} and POST /manage/admin/user-group/{user_group_id}/add-users endpoints in ee/onyx/server/user_group/api.py call update_user_group and add_users_to_user_group in ee/onyx/db/user_group.py without enforcing _validate_curator_can_modify_group, allowing a curator to add accounts to arbitrary groups and obtain document access through get_acl_for_user and the OpenSearch access_control_list filter. This issue is fixed in version 4.3.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-63178 since 07/16/2026. The exploitation is known to be easy. The attack may be launched remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 4.3.0 eliminates this vulnerability.

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Productinfo

Vendor

• onyx-dot-app

Name

• Onyx

Version

• 4.0
• 4.1
• 4.2

Website

• Product: https://github.com/onyx-dot-app/onyx/

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