What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-17 · updated 2026-10-23
• Weakness: CWE-639

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.

Affected products

• onyx-dot-app onyx: before 4.3.0

References

• https://github.com/onyx-dot-app/onyx/commit/46e19cc2750fed659488cb12a1f171016ba5a099
• https://github.com/onyx-dot-app/onyx/commit/b9e1c6894be3c237283f4b5fd4eb0af935b40664
• https://github.com/onyx-dot-app/onyx/pull/12525
• https://github.com/onyx-dot-app/onyx/pull/12549
• https://github.com/onyx-dot-app/onyx/releases/tag/v4.3.0
• https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m
• https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m

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