high8.7
CVE-2026-27818
TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist
Impact
### Impact A validation bug allows an attacker to proxy domains not explicitly allowed in the `proxyableDomains` configuration. The validation only checks if a hostname _ended_ with an allowed domain. This meant: If `example.com` is allowed in `proxyableDomains`: - ✅ example.com is allowed (correct) - ✅ api.example.com is allowed (correct) - ⚠️ maliciousexample.com is allowed (incorrect) An attacker could register maliciousexample.com and proxy content through `terriajs-server`, bypassing proxy restrictions. ### Patches All versions up to 4.0.2 are affected. Upgrade to 4.0.3 to address the vulnerability.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | terriajs-server | < 4.0.3 | 4.0.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Terria | Terriajs-Server | before 4.0.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/TerriaJS/terriajs-server/commit/3aaa5d9717162b245ae4569232bbe7d8673c913f
- https://github.com/TerriaJS/terriajs-server/security/advisories/GHSA-w789-49fc-v8hr
- https://github.com/advisories/GHSA-w789-49fc-v8hr
- https://nvd.nist.gov/vuln/detail/CVE-2026-27818
- https://github.com/TerriaJS/terriajs-server/releases/tag/4.0.3