terriajs/terriajs-server · Security
TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist
- GHSA ID
- GHSA-w789-49fc-v8hr
- CVE ID
- CVE-2026-27818
- Severity
- high
- Published
- Updated
- CVSS v4
- 8.7 · 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
Description
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.
CWEs
- CWE-20 · Improper Input Validation
- CWE-918 · Server-Side Request Forgery (SSRF)
References
- 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 ↗
- https://github.com/TerriaJS/terriajs-server/releases/tag/4.0.3 ↗
- https://github.com/advisories/GHSA-w789-49fc-v8hr ↗