Input validation error in TerriaJS-Server - CVE-2026-27818
Published: April 27, 2026
Vulnerability identifier: #VU128072
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-27818
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Terria
Affected software:
TerriaJS-Server
TerriaJS-Server
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass proxy domain restrictions.
The vulnerability exists due to improper input validation in proxy allowlist domain validation when handling proxy requests against configured proxyable domains. A remote attacker can supply a hostname that ends with an allowed domain string to bypass proxy domain restrictions.
An attacker-controlled domain such as maliciousexample.com may be incorrectly accepted when example.com is allowlisted.
How to mitigate CVE-2026-27818
Install security update from vendor's website.