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CVE-2026-63178— Onyx Curator-scope IDOR: any curator can modify membership of arbitrary user groups via unscoped PATCH /manage/admin/user-group/{id} and /add-users leading to cross-group document disclosure

Quick assessment

Affected
onyx-dot-app onyx
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Onyx是Onyx公司的一个AI大模型平台。 Onyx 4.3.0之前版本存在授权问题漏洞，该漏洞源于ee/onyx/server/user_group/api.py中的PATCH /manage/admin/user-group/{user_group_id}和POST /manage/admin/user-group/{user_group_id}/add-users端点调用ee/onyx/db/user_group.py中的update_user_group和add_users_to_user_gr

CVSS 6.5 · Medium EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
onyx-dot-app onyx < 4.3.0 affected
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I. Basic Information for CVE-2026-63178

Vulnerability Information
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Vulnerability Title
Onyx Curator-scope IDOR: any curator can modify membership of arbitrary user groups via unscoped PATCH /manage/admin/user-group/{id} and /add-users leading to cross-group document disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Onyx 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Onyx是Onyx公司的一个AI大模型平台。 Onyx 4.3.0之前版本存在授权问题漏洞，该漏洞源于ee/onyx/server/user_group/api.py中的PATCH /manage/admin/user-group/{user_group_id}和POST /manage/admin/user-group/{user_group_id}/add-users端点调用ee/onyx/db/user_group.py中的update_user_group和add_users_to_user_gr
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
onyx-dot-app onyx < 4.3.0 -

II. Public POCs for CVE-2026-63178

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III. Intelligence Information for CVE-2026-63178

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Patches & Fixes for CVE-2026-63178 (4)

Vendor Advisories for CVE-2026-63178 (1)

IV. Related Vulnerabilities

Same product: onyx
Same vendor: onyx-dot-app
Same weakness: CWE-639

V. Comments for CVE-2026-63178

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