nebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalation

{
  "id": "8cf970a44e523940f694ed14f704192edd80b2bc0561f378c39f81f47738b8c5",
  "url": "https://osv.dev/vulnerability/CVE-2026-47724",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalation",
    "summary": "nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.4, the `/api/v1/*` route surface trusts the bearer token alone for authorisation on most endpoints. The codebase itself admits this at `internal/api/hosts.go:384`: \"API trusts the bearer token for authorisation; per-CA ownership is enforced only in the Web layer.\" The Web UI gates state-changing routes through `loadAccessibleCA` (`internal/web/cas.go`); CA-management endpoints in `internal/api/cas.go` ALSO have proper `canAccessCA` gates. The gap is on the host, network, firewall, mobile-bundle, and most operator endpoints. Combined with the per-operator CA model from ADR 0002, this gives any non-admin operator API key broad cross-tenant access — instant privilege escalation in the worst case. Version 0.3.4 fixes the issue.",
    "evidence": "osv:CVE-2026-47724",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-47724",
      "aliases": [
        "CVE-2026-47724",
        "GHSA-598g-h2vc-h5vg",
        "GO-2026-5139"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/forgekeep/nebula-mesh",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b84f5ce051b9c3d692f28b513a566e54e11a55d6"
                },
                {
                  "fixed": "9d8bcd7667ecd0c2975cc71fb35a02fe131f76f2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.3.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9d8bcd7667ecd0c2975cc71fb35a02fe131f76f2"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.0",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47724.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.518038716Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47724.json",
        "https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-598g-h2vc-h5vg",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-47724",
        "https://github.com/forgekeep/nebula-mesh/commit/9d8bcd7667ecd0c2975cc71fb35a02fe131f76f2"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47724.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-47724",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513794,
  "published_at": "2026-07-23T20:20:59.494+00:00"
}