Kanboard's privilege escalation via mass assignment in user invite registration allows any invited user to become admin

{
  "id": "91f094d72a5970d696c04251d3e3cfcc79a992c3430f6f47ee8c86cdd3e5159a",
  "url": "https://osv.dev/vulnerability/CVE-2026-29056",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Kanboard's privilege escalation via mass assignment in user invite registration allows any invited user to become admin",
    "summary": "Kanboard is project management software focused on Kanban methodology. Prior to 1.2.51, Kanboard's user invite registration endpoint (`UserInviteController::register()`) accepts all POST parameters and passes them to `UserModel::create()` without filtering out the `role` field. An attacker who receives an invite link can inject `role=app-admin` in the registration form to create an administrator account. Version 1.2.51 fixes the issue.",
    "evidence": "osv:CVE-2026-29056",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-29056",
      "aliases": [
        "CVE-2026-29056",
        "GHSA-2jvj-q44v-6p3x"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/kanboard/kanboard",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1c27f48cc2ef2bfbf6097c5ec19e61d1aa60dba6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.2.51"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:kanboard:kanboard:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.2.51"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.50",
            "v1.2.49",
            "v1.2.47",
            "v1.2.46",
            "v1.2.45",
            "v1.2.44",
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            "v1.2.32",
            "v1.2.31",
            "v1.2.30",
            "v1.2.29",
            "v1.2.28",
            "v1.2.27",
            "v1.2.26",
            "v1.2.25",
            "v1.2.24",
            "v1.2.23",
            "v1.2.22",
            "v1.2.21",
            "v1.2.20",
            "v1.2.19",
            "v1.2.18",
            "v1.2.17",
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            "v1.2.10",
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            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29056.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.046611055Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29056.json",
        "https://github.com/kanboard/kanboard/security/advisories/GHSA-2jvj-q44v-6p3x",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-29056"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-915"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29056.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-29056",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498098,
  "published_at": "2026-03-18T01:56:19.315+00:00"
}