CVE-2026-27818

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

CVSS 8.7 HIGHEPSS 0.2%CWE-20 CWE-918

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.7EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

26 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

TerriaJS · terriajs-server

References

https://github.com/TerriaJS/terriajs-server/commit/3aaa5d9717162b245ae4569232bbe7d8673c913f https://github.com/TerriaJS/terriajs-server/security/advisories/GHSA-w789-49fc-v8hr