What is CVE-2026-27818?

CVE-2026-27818 is a high-severity vulnerability in Terria Terriajs-Server, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-02-26.

How severe is CVE-2026-27818?

High severity. CVSS v3 base score is 7.5 out of 10.

SSRF in Terria Terriajs-Server

CVE-2026-27818

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.002 (15.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Terria Terriajs-server
Terriajs Terriajs-server — versions < 4.0.3

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-27818?: CVE-2026-27818 is a high-severity vulnerability in Terria Terriajs-Server, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-02-26.
How severe is CVE-2026-27818?: High severity. CVSS v3 base score is 7.5 out of 10.