{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.3.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "46e19cc2750fed659488cb12a1f171016ba5a099"
            },
            {
              "fixed": "b9e1c6894be3c237283f4b5fd4eb0af935b40664"
            },
            {
              "fixed": "2f04145071ec68783febf28576c2c416cb40390f"
            }
          ],
          "repo": "https://github.com/onyx-dot-app/onyx",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-7f48-vgpj-h95m"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63178.json"
  },
  "details": "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.",
  "id": "CVE-2026-63178",
  "modified": "2026-08-20T03:30:23.493521350Z",
  "published": "2026-08-17T21:30:40.463Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/onyx-dot-app/onyx/releases/tag/v4.3.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63178.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-7f48-vgpj-h95m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63178"
    },
    {
      "type": "FIX",
      "url": "https://github.com/onyx-dot-app/onyx/commit/46e19cc2750fed659488cb12a1f171016ba5a099"
    },
    {
      "type": "FIX",
      "url": "https://github.com/onyx-dot-app/onyx/commit/b9e1c6894be3c237283f4b5fd4eb0af935b40664"
    },
    {
      "type": "FIX",
      "url": "https://github.com/onyx-dot-app/onyx/pull/12525"
    },
    {
      "type": "FIX",
      "url": "https://github.com/onyx-dot-app/onyx/pull/12549"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "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"
}