How severe is CVE-2026-27818?

CVE-2026-27818 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-27818 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27818?

CVE-2026-27818 affects Terria Terriajs-server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27818?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-27818 have an EU (EUVD) identifier?

Yes. CVE-2026-27818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8783.

When was CVE-2026-27818 published?

CVE-2026-27818 was published on 2026-02-26 and last updated on 2026-06-17.

CVE-2026-27818

CVE-2026-27818 is a high-severity vulnerability in Terria Terriajs-server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8783
Weakness: CWE-20
Affected product: Terria Terriajs-server
Published: 2026-02-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-27818?: CVE-2026-27818 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-27818 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27818?: CVE-2026-27818 affects Terria Terriajs-server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27818?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-27818 have an EU (EUVD) identifier?: Yes. CVE-2026-27818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8783.
When was CVE-2026-27818 published?: CVE-2026-27818 was published on 2026-02-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:terria:terriajs-server:*:*:*:*:*:node.js:*:*

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