Is CVE-2026-63178 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-63178 being exploited in the wild.

How severe is CVE-2026-63178?

Medium severity, with a CVSS score of 6.5, published 17 August 2026.

Which products and versions are affected?

Onyx Enterprise Edition before 4.3.0.

Is there a fix for CVE-2026-63178?

A patch was published on 2026-06-30: Fix released in version 4.3.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-63178 attacked?

It is attacked over the network.

Am I affected by CVE-2026-63178?

Check whether you run Onyx Enterprise Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-63178: Onyx authorization bypass in user group management

CVE-2026-63178 · Severity: medium · CVSS 6.5 · Published 2026-08-17

Onyx is an open-source AI platform that manages user access and document permissions. Prior to version 4.3.0, the Enterprise Edition failed to properly validate permissions when curators modified user groups, allowing a curator to add users to arbitrary groups and gain unauthorized access to documents they should not see. This could result in sensitive data exposure through unauthorized document access.

Vendors: Onyx.

Quick answers

Is CVE-2026-63178 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-63178 being exploited in the wild.
How severe is CVE-2026-63178?: Medium severity, with a CVSS score of 6.5, published 17 August 2026.
Which products and versions are affected?: Onyx Enterprise Edition before 4.3.0.
Is there a fix for CVE-2026-63178?: A patch was published on 2026-06-30: Fix released in version 4.3.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-63178 attacked?: It is attacked over the network.
Am I affected by CVE-2026-63178?: Check whether you run Onyx Enterprise Edition at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is an authorization bypass in the user group management API endpoints. The 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 failed to call the _validate_curator_can_modify_group authorization check when invoking update_user_group and add_users_to_user_group functions in ee/onyx/db/user_group.py. An authenticated curator can exploit this to add arbitrary user accounts to groups they do not manage, then use the get_acl_for_user function and OpenSearch access_control_list filter to access documents assigned to those groups. The vulnerability was fixed in version 4.3.0 by implementing proper authorization validation on curator group modifications.

Affected products

Onyx Onyx Enterprise Edition before 4.3.0

Timeline

2026-08-17: disclosed
2026-06-30: patched: Fix released in version 4.3.0

References

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