What is the CVSS score of CVE-2026-27818?

CVE-2026-27818 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.1%.

Which versions of Node.js are affected by CVE-2026-27818?

TerriaJS-Server versions before 4.0.3 contain a validation flaw that allows attackers to bypass proxy domain restrictions, potentially enabling unauthorized data access and lateral movement.. A patch is available.

How to fix or mitigate CVE-2026-27818?

Within 24 hours: Identify all systems running TerriaJS-Server and document current versions. Within 7 days: Apply vendor patch to upgrade to version 4.0.3 or later across all affected instances; test in staging environment first. Within 30 days: Conduct audit of proxy logs for suspicious domain access patterns and validate proxyableDomains configuration post-patch.

Node.js CVE-2026-27818

HIGH

Improper Input Validation (CWE-20)

2026-02-26 security-advisories@github.com

GHSA-w789-49fc-v8hr

Node.js Terriajs Server

7.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

Patch released

Mar 04, 2026 - 21:12 nvd

Patch available

CVE Published

Feb 26, 2026 - 00:16 nvd

HIGH 7.5

DescriptionGitHub Advisory

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.

AnalysisAI

Improper input validation in TerriaJS-Server versions before 4.0.3 allows unauthenticated remote attackers to bypass domain allowlist restrictions and proxy requests to arbitrary domains. This vulnerability affects Node.js deployments of TerriaJS and could enable attackers to access restricted resources or perform server-side request forgery attacks. A patch is available in version 4.0.3 and later.

Technical ContextAI

Classified as CWE-20 (Improper Input Validation). Affects Terriajs-Server. 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.

RemediationAI

A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.

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CVE-2026-27818 vulnerability details – vuln.today

Back

Node.js CVE-2026-27818

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

DescriptionGitHub Advisory

AnalysisAI

Technical ContextAI

RemediationAI

More in Node.js

Same weakness CWE-20 – Improper Input Validation

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External POC / Exploit Code