InvoicePlane: Primary Administrator Privilege Downgrade via `Users::form()` (Missing Object-Level Authorization)

{
  "id": "2fd1e64ecd0cc6f765d5f006319d2a90268730a747c56a4b7f85cd21fc7aad17",
  "url": "https://osv.dev/vulnerability/CVE-2026-100392",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "InvoicePlane: Primary Administrator Privilege Downgrade via `Users::form()` (Missing Object-Level Authorization)",
    "summary": "InvoicePlane is a self-hosted open source application for managing invoices, clients, and payments. In version 1.7.2, Users::form() performs no object-level authorization check on user_id = 1. A Secondary Administrator (user_type = 1, user_id != 1) can rewrite the Primary Administrator's user_type to 2 (Guest / read-only), destroying the root account's privilege and locking the legitimate owner out of the instance. At time of publication, there are no publicly available patches.",
    "evidence": "osv:CVE-2026-100392",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-100392",
      "aliases": [
        "CVE-2026-100392",
        "GHSA-4fxw-x7wr-x6qc"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/invoiceplane/invoiceplane",
              "type": "GIT",
              "events": [
                {
                  "introduced": "aaeea1e4825785c6138fa84be49ac373bac4f0af"
                },
                {
                  "last_affected": "aaeea1e4825785c6138fa84be49ac373bac4f0af"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "= 1.7.2"
                      },
                      {
                        "last_affected": "= 1.7.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandaloneSingleVersion"
                  }
                ]
              }
            }
          ],
          "versions": [
            "= 1.7.2",
            "v1.7.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100392.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.501958282Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100392.json",
        "https://github.com/InvoicePlane/InvoicePlane/security/advisories/GHSA-4fxw-x7wr-x6qc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100392"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100392.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100392",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 496189,
  "published_at": "2026-09-28T20:16:19.121+00:00"
}