---
id: CVE-2026-63178
title: Onyx is an open-source AI platform
summary: >-
  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 u…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-639
published: '2026-08-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63178'
references:
  - url: >-
      https://github.com/onyx-dot-app/onyx/commit/46e19cc2750fed659488cb12a1f171016ba5a099
    label: security-advisories@github.com
  - url: >-
      https://github.com/onyx-dot-app/onyx/commit/b9e1c6894be3c237283f4b5fd4eb0af935b40664
    label: security-advisories@github.com
  - url: 'https://github.com/onyx-dot-app/onyx/pull/12525'
    label: security-advisories@github.com
  - url: 'https://github.com/onyx-dot-app/onyx/pull/12549'
    label: security-advisories@github.com
  - url: 'https://github.com/onyx-dot-app/onyx/releases/tag/v4.3.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m
    label: security-advisories@github.com
  - url: >-
      https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00362
epssPercentile: 0.30023
ingestedAt: '2026-09-18T20:51:25.625Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.