CVE-2026-27818: TerriaJS-Server is a NodeJS Express server for TerriaJS, a library for building web-based geospatial data expl

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-27818 is a high-severity flaw (CVSS 7.5) affecting terriajs-server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-20, CWE-918
Published	2026-02-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: terria

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-26 00:16 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

terria terriajs-server UPGRADE

Affected: < 4.0.3

Fixed in: 4.0.3

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls terriajs-server

2. UPGRADE to 4.0.3

npm install terriajs-server@">=4.0.3"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27818?

terriajs-server: upgrade to 4.0.3. Exact commands for each OS are on this page.

Is CVE-2026-27818 being exploited?

CVE-2026-27818 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27818 affect?

CVE-2026-27818 affects terriajs-server. Severity is high (CVSS 7.5). 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 `proxyableDom

How urgent is CVE-2026-27818?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

References

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