nebula-mesh: Operator session tokens stored in plaintext in the database

{
  "id": "4afe9b336da55bc4850d9fb651b7f0b116174d97c43def5cf3c09e960e1b22b0",
  "url": "https://osv.dev/vulnerability/CVE-2026-53603",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nebula-mesh: Operator session tokens stored in plaintext in the database",
    "summary": "nebula-mesh is a self-hosted control plane for Slack Nebula mesh VPN. Prior to version 0.3.8, Operator session tokens are stored in plaintext in the operator_sessions table (the token column is the PRIMARY KEY). The session token is a 32-byte random hex value sent directly in a cookie and valid for 24 hours. Anyone who can read the database (backup, snapshot, file copy, or SQL-level disclosure) obtains every active session token and can hijack operator sessions directly, with no further authentication. This issue has been patched in version 0.3.8.",
    "evidence": "osv:CVE-2026-53603",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-53603",
      "aliases": [
        "CVE-2026-53603",
        "GHSA-q4vm-pq3q-8wgq",
        "GO-2026-5991"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/forgekeep/nebula-mesh",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "7cb01bab281ded557f8b6c81dab5f48d4c10182e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.3.8"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7cb01bab281ded557f8b6c81dab5f48d4c10182e"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7cb01bab281ded557f8b6c81dab5f48d4c10182e"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.3.8"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.3.8"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.3.7",
            "v0.3.6",
            "v0.3.5",
            "v0.3.4",
            "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-2026-53603.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.488804628Z",
      "provider": "osv",
      "references": [
        "https://github.com/forgekeep/nebula-mesh/releases/tag/v0.3.8",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53603.json",
        "https://github.com/forgekeep/nebula-mesh/security/advisories/GHSA-q4vm-pq3q-8wgq",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53603",
        "https://github.com/forgekeep/nebula-mesh/commit/7cb01bab281ded557f8b6c81dab5f48d4c10182e"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-312",
          "CWE-522"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53603.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53603",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504784,
  "published_at": "2026-09-04T19:40:31.548+00:00"
}