Is CVE-2018-18991 actively exploited?

No active exploitation of CVE-2018-18991 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-18991 be exploited remotely?

Yes. CVE-2018-18991 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-18991?

CVE-2018-18991 has a CVSS score of 6.1 (MEDIUM).

HOME VULNERABILITIESCVE-2018-18991

MEDIUM

CVE-2018-18991

CWE-79Published: December 4, 2018· Updated: Jun 17, 2026

6.1

CVSS v3.1

Official Description

Reflected cross-site scripting (non-persistent) in SCADA WebServer (Versions prior to 2.03.0001) could allow an attacker to send a crafted URL that contains JavaScript, which can be reflected off the web application to the victim's browser.

NVD Source

Technical Analysis

CVE-2018-18991 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.