TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist
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 software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | terriajs-server | < 4.0.3 | 4.0.3 |
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
- https://github.com/TerriaJS/terriajs-server/releases/tag/4.0.3
- CVSS 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- Weakness (CWE)
CWE-20, CWE-918- Platform
- npm
- Package
terriajs-server- Disclosed
- 26.02.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-w789-49fc-v8hr - CC BY 4.0
Vulnerability history: terriajs-server
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 05.2019 02.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 1
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TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist this entry
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