Penpot: Team admin can escalate to owner via team invitation (missing owner-role guard on the invitation path)

{
  "id": "8a904bd6a7b40ab376685a6096e5b39dd0fb1ff59da88b0f3f418e6d55e9761d",
  "url": "https://osv.dev/vulnerability/CVE-2026-105688",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Penpot: Team admin can escalate to owner via team invitation (missing owner-role guard on the invitation path)",
    "summary": "Penpot is an open-source design and prototyping platform. Prior to 2.18.0, create-team-invitations and the invitation acceptance path allow a non-owner team administrator to assign the owner role because invitation roles are persisted and applied without the role-ceiling check used by update-team-member-role. An administrator can invite another account as an owner, create multiple owners, and then use the new owner account to obtain owner-only control over the team. This issue is fixed in version 2.18.0.",
    "evidence": "osv:CVE-2026-105688",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-105688",
      "aliases": [
        "CVE-2026-105688",
        "GHSA-mx4v-cmxq-644v"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/penpot/penpot",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5baffdc213f0deaaeb318e97a41d611ac0656a94"
                },
                {
                  "fixed": "5efd9cc3c5689485322f57b644b83a3bd2e33cee"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.18.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5efd9cc3c5689485322f57b644b83a3bd2e33cee"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5baffdc213f0deaaeb318e97a41d611ac0656a94"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "2.18.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.17.1-RC5",
            "2.18.0-RC1",
            "2.17.1-RC4",
            "2.17.1-RC3",
            "2.17.1-RC2",
            "2.17.1-RC1",
            "2.17.0",
            "2.17.0-RC6",
            "2.17.0-RC5",
            "2.17.0-RC4",
            "2.17.0-RC3",
            "2.17.0-RC1",
            "2.16.1-RC2",
            "2.16.0",
            "2.16.0-RC13",
            "2.16.0-RC11",
            "2.16.0-RC9",
            "2.16.0-RC8",
            "2.16.0-RC7",
            "2.16.0-RC6",
            "2.16.0-RC5",
            "2.16.0-RC4",
            "2.16.0-RC3",
            "2.16.0-RC2",
            "2.16.0-RC1",
            "2.15.0-RC1",
            "2.14.0-RC4",
            "2.14.0-RC3",
            "2.14.0-RC2",
            "2.14.0-RC1",
            "2.10.0-RC1",
            "2.7.0-RC1",
            "2.6.0-RC1",
            "2.5.0-RC1",
            "2.5.0-DEV",
            "pre-lazy-loading",
            "1.14.1-beta",
            "1.14.0-beta",
            "1.9.0-alpha",
            "1.8.2-alpha",
            "1.8.1-alpha",
            "1.8.0-alpha",
            "1.7.4-alpha",
            "1.7.3-alpha",
            "1.7.2-alpha",
            "1.7.1-alpha",
            "1.7.0-alpha",
            "1.6.5-alpha",
            "1.6.4-alpha",
            "1.6.3-alpha",
            "1.6.2-alpha",
            "1.6.1-alpha",
            "1.6.0-alpha",
            "1.5.4-alpha",
            "1.5.3-alpha",
            "1.5.2-alpha",
            "1.5.1-alpha",
            "1.5.0-alpha",
            "1.4.1-alpha",
            "1.4.0-alpha",
            "1.4.0-dev",
            "1.3.0-alpha",
            "1.2.0-alpha",
            "1.1.0-alpha",
            "1.0.0-alpha",
            "0.1.0",
            "0.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105688.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.096967490Z",
      "provider": "osv",
      "references": [
        "https://github.com/penpot/penpot/releases/tag/2.18.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105688.json",
        "https://github.com/penpot/penpot/security/advisories/GHSA-mx4v-cmxq-644v",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-105688",
        "https://github.com/penpot/penpot/commit/5efd9cc3c5689485322f57b644b83a3bd2e33cee"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-269"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105688.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-105688",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491461,
  "published_at": "2026-10-05T19:50:01.439+00:00"
}