{"id":"CVE-2026-27818","aliases":["EUVD-2026-8783","GHSA-w789-49fc-v8hr"],"status":"published","title":"TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist","description":"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.","severity":{"version":"4.0","score":8.7,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0028,"percentile":0.20754,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20","CWE-918"],"published":"2026-02-26T00:02:45Z","modified":"2026-10-28T02:30:49Z","fixes":[{"ecosystem":"npm","package":"terriajs-server","fixed_in":["4.0.3"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"terriajs-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.3"}]}]},{"source":"osv","ecosystem":"npm","package":"terriajs-server","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.0.3"}]}]}],"products":[{"vendor":"terria","product":"terriajs-server"},{"vendor":"terriajs","product":"terriajs-server"}],"references":[{"url":"https://github.com/TerriaJS/terriajs-server/security/advisories/GHSA-w789-49fc-v8hr","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/TerriaJS/terriajs-server/commit/3aaa5d9717162b245ae4569232bbe7d8673c913f","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27818","tags":["advisory"]},{"url":"https://github.com/TerriaJS/terriajs-server/releases/tag/4.0.3","tags":["web"]},{"url":"https://github.com/advisories/GHSA-w789-49fc-v8hr"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27818.json","tags":["advisory"]},{"url":"https://github.com/TerriaJS/terriajs-server","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-27818","title":"TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist","description":"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.","status":"published","published":"2026-02-26T00:02:45.127Z","modified":"2026-02-26T15:16:30.58Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-20","CWE-918"],"updated_at":"2026-11-02T14:19:48.826324Z"}],"euvd":[{"id":"EUVD-2026-8783","description":"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.","status":"published","published":"2026-02-26T00:02:45Z","modified":"2026-02-26T15:16:30Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"updated_at":"2026-11-02T19:48:26.495238Z"}],"ghsa":[{"id":"GHSA-w789-49fc-v8hr","title":"TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist","description":"### Impact\nA validation bug allows an attacker to proxy domains not explicitly allowed in the `proxyableDomains` configuration.\n\nThe validation only checks if a hostname _ended_ with an allowed domain. This meant:\n\nIf `example.com` is allowed in `proxyableDomains`:\n\n- ✅ example.com is allowed (correct)\n- ✅ api.example.com is allowed (correct)\n- ⚠️ maliciousexample.com is allowed (incorrect)\n\nAn attacker could register maliciousexample.com and proxy content through `terriajs-server`, bypassing proxy restrictions.\n\n### Patches\nAll versions up to 4.0.2 are affected. Upgrade to 4.0.3 to address the vulnerability.","status":"published","published":"2026-02-26T15:22:11Z","modified":"2026-02-26T15:22:12Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-20","CWE-918"],"updated_at":"2026-11-02T14:39:27.949248Z"}],"nvd":[{"id":"CVE-2026-27818","description":"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.","status":"published","published":"2026-02-26T00:16:26.653Z","modified":"2026-06-17T10:27:44.177Z","cvss":[{"version":"4.0","score":8.7,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-20","CWE-918"],"updated_at":"2026-11-02T14:12:07.027269Z"}],"osv":[{"id":"CVE-2026-27818","title":"TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist","description":"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.","status":"published","published":"2026-02-26T00:02:45.127Z","modified":"2026-10-28T02:30:49.781975038Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-20","CWE-918"],"updated_at":"2026-11-02T15:45:00.180685Z"},{"id":"GHSA-w789-49fc-v8hr","title":"TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist","description":"### Impact\nA validation bug allows an attacker to proxy domains not explicitly allowed in the `proxyableDomains` configuration.\n\nThe validation only checks if a hostname _ended_ with an allowed domain. This meant:\n\nIf `example.com` is allowed in `proxyableDomains`:\n\n- ✅ example.com is allowed (correct)\n- ✅ api.example.com is allowed (correct)\n- ⚠️ maliciousexample.com is allowed (incorrect)\n\nAn attacker could register maliciousexample.com and proxy content through `terriajs-server`, bypassing proxy restrictions.\n\n### Patches\nAll versions up to 4.0.2 are affected. Upgrade to 4.0.3 to address the vulnerability.","status":"published","published":"2026-02-26T15:22:11Z","modified":"2026-02-26T15:32:54.424919Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-20","CWE-918"],"updated_at":"2026-11-02T15:46:58.401149Z"}]}}