TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist

{
  "id": "d76568db967b4a50bc57052cc70a23a879e51cf1c5801e0042b7e831abd10a19",
  "url": "https://osv.dev/vulnerability/CVE-2026-27818",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist",
    "summary": "TerriaJS-Server is a NodeJS Express server for TerriaJS, a library for building web-based geospatial data explorers. A validation bug in versions prior to 4.0.3 allows an attacker to proxy domains not explicitly allowed in the `proxyableDomains` configuration. Version 4.0.3 fixes the issue.",
    "evidence": "osv:CVE-2026-27818",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-27818",
      "aliases": [
        "CVE-2026-27818",
        "GHSA-w789-49fc-v8hr"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/terriajs/terriajs-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2689f9966c59bc28f9c4d27c49b4fd06a097dfc4"
                },
                {
                  "fixed": "3aaa5d9717162b245ae4569232bbe7d8673c913f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:terria:terriajs-server:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.0.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3aaa5d9717162b245ae4569232bbe7d8673c913f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.0.2",
            "4.0.1",
            "4.0.0",
            "3.3.4",
            "3.3.3",
            "3.3.1",
            "3.3.0",
            "3.2.0",
            "3.1.0",
            "3.0.1",
            "3.0.0",
            "2.9.2",
            "2.9.1",
            "2.9.0",
            "2.8.0",
            "2.7.3",
            "2.7.2",
            "2.7.1",
            "2.7.0",
            "2.6.7",
            "2.6.6",
            "2.6.5",
            "2.6.4",
            "2.6.3",
            "2.6.2",
            "2.6.1",
            "2.6.0",
            "2.5.1",
            "2.5.0",
            "2.4.0",
            "2.3.0",
            "2.2.2",
            "2.2.1",
            "2.2.0",
            "2.0.0",
            "2.1.0",
            "1.4.1",
            "1.4.0",
            "v1.3.0",
            "1.3.0",
            "v1.2.0",
            "1.2.0",
            "v1.1.3",
            "1.1.3",
            "v1.1.2",
            "1.1.2",
            "v1.1.1",
            "1.1.1",
            "1.1.0",
            "1.0.0",
            "0.0.8"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27818.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.781975038Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27818.json",
        "https://github.com/TerriaJS/terriajs-server/security/advisories/GHSA-w789-49fc-v8hr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-27818",
        "https://github.com/TerriaJS/terriajs-server/commit/3aaa5d9717162b245ae4569232bbe7d8673c913f"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20",
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27818.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-27818",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517829,
  "published_at": "2026-02-26T00:02:45.127+00:00"
}