CVE-2026-27818 PUBLISHED

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

Assigner: GitHub_M
Reserved: 24.02.2026 Published: 26.02.2026 Updated: 26.02.2026

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.

Metrics

CVSS 4.0

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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	TerriaJS
Product	terriajs-server
Versions	Version < 4.0.3 is affected

References

Problem Types

CWE-20: Improper Input Validation CWE
CWE-918: Server-Side Request Forgery (SSRF) CWE