Is CVE-2023-40312 actively exploited?

No active exploitation of CVE-2023-40312 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-40312 be exploited remotely?

Partially. CVE-2023-40312 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2023-40312?

CVE-2023-40312 has a CVSS score of 5.2 (MEDIUM).

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MEDIUM

CVE-2023-40312

CWE-79Published: August 14, 2023· Updated: Jun 17, 2026

5.2

CVSS v3.1

Official Description

Multiple reflected XSS were found on different JSP files with unsanitized parameters in OpenMNS Horizon 31.0.8 and versions earlier than 32.0.2 on multiple platforms that an attacker can modify to craft a malicious XSS payload. The solution is to upgrade to Meridian 2023.1.6, 2022.1.19, 2021.1.30, 2020.1.38 or Horizon 32.0.2 or newer. Meridian and Horizon installation instructions state that they are intended for installation within an organization's private networks and should not be directly accessible from the Internet. OpenNMS thanks Jordi Miralles Comins for reporting this issue.

NVD Source

Technical Analysis

CVE-2023-40312 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

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.