CVE-2026-27818

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

State: Published
Severity: 8.7 High
Published: Feb 26, 2026
Updated: Feb 26, 2026
Reserved: Feb 24, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
terriajs-serverTerriaJS	< 4.0.3Affected

References

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